A refractometer helps laboratories and production teams check a sample’s refractive index or an instrument-specific concentration scale, such as Brix. The right choice depends on what you are measuring, the expected range, the accuracy required and whether you work at the production line, in the field or at a laboratory bench. This guide explains those differences and compares the instruments available from Lee Hung Scientific.

What does a refractometer measure

A refractometer measures refractive index: how much light changes direction as it passes through a sample. Depending on the instrument and its scale, that reading may be displayed as refractive index (nD), Brix or a concentration value calibrated for a particular application. Before ordering, confirm that the displayed scale matches the result your process needs.

Brix (°Bx) is based on sucrose dissolved in water. For a pure sucrose solution, 10° Brix corresponds to 10 g of sucrose per 100 g of solution under the defined reference conditions. In fruit juice, sauces or industrial mixtures, other dissolved substances can affect the reading. Brix can therefore be a useful process or quality-control indicator, but it should not automatically be treated as the exact sugar content of every complex sample.

Where are refractometers used

•  Food and beverage: Checking the consistency of juices, syrups, sauces, jams and other products against a defined Brix range.
•  Agriculture: Testing plant juices close to the source using an instrument suited to the expected range and sample type.
•  Laboratories and industry: Measuring refractive index or concentration for formulation, quality control and process fluids using a suitable scale or method.

The same model will not suit every liquid. A low-Brix beverage, concentrated syrup and petroleum-related sample can require different measurement ranges or scales.

Hand-held, portable digital or automatic

An optical hand-held refractometer is portable and requires the user to read a scale through the eyepiece. Lee Hung’s hand-held range includes MASTER-RI for refractive index measurement of samples such as vegetable oils and petroleum products, MASTER-AGRI for Brix in plant juices, and MASTER-10 models for low-concentration Brix measurements up to 10%. Their different scales matter more than the fact that all three are portable.

Portable digital PAL models display Brix directly, reducing the need to interpret an optical scale. They suit routine checks where only a few drops of sample are available. A benchtop automatic instrument such as the RX-5000α offers a broader range, finer resolution and controlled measurement temperature for demanding laboratory work.

Compare four refractometer models

These headline figures help narrow the options. Resolution tells you the smallest displayed increment; accuracy describes the stated closeness of a measurement to the reference. Check both rather than choosing by range alone.

The three PAL models provide 0.1% Brix resolution, use about 2–3 drops of sample, give a reading in approximately three seconds and carry an IP65 water-resistant rating. PAL-α and PAL-3 list automatic temperature compensation from 10°C to 100°C. Their main differences for a buyer are measurement range and, for PAL-3, its tighter stated Brix accuracy.

For laboratory work, the RX-5000α also measures refractive index from 1.32700 to 1.58000 nD, with stated nD accuracy of ±0.00004. It has 0.01% Brix resolution, 0.00001 nD refractive-index resolution and temperature control from 5.00°C to 60.00°C. Its built-in thermo-module removes the need for a separate constant-temperature water bath for instrument temperature control. Results can be sent to compatible printers or computers via its specified RS-232C interface.

View model details: PAL-1  |  PAL-α  |  PAL-3  |  RX-5000α

How to choose the right refractometer

•  Start with the sample and scale. Do you need Brix, refractive index or a different concentration scale? Check that the instrument and its method suit the material being tested.
•  Match the expected range. A unit that does not cover the sample cannot provide the result you need. Consider the lowest and highest values you expect in routine use.
•  Set your accuracy requirement. Routine process checks and controlled laboratory testing may call for different levels of accuracy and resolution.
•  Consider temperature and workflow. Temperature affects refractive index. Decide whether temperature compensation or active control is appropriate, where testing will take place and how many measurements operators will make.

For frequent production checks, a portable digital model may simplify reading. For controlled laboratory measurements or work requiring both Brix and refractive index, compare the automatic benchtop model against your procedure.

Refractometer support in Singapore

Established in 1983, Lee Hung Scientific supplies hand-held, portable digital and automatic refractometers. To narrow the choice, share your sample type, expected range, required accuracy, testing location and any method or documentation requirements. The team can discuss the available models and provide product information for your application.

Explore the range: Refractometers at Lee Hung Scientific

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A chemical splash can expose a worker’s eyes or skin in seconds. Emergency showers and eyewash stations provide a way to begin flushing promptly while the workplace follows its emergency response procedures. Choosing the right unit depends on the substances handled, the area of the body that could be affected, and where the equipment can be installed.
In Singapore, the Ministry of Manpower (MOM) states that workplaces using toxic or corrosive chemicals must provide an eyewash station or nearby water facilities for quick flushing where accidental eye or body contact could occur. A workplace risk assessment should guide the type and location of equipment selected.

Which type of emergency washing equipment do you need

An eyewash station is intended to flush the eyes after exposure. An emergency shower can rinse a larger area of the body when chemicals may splash onto clothing or skin. A combination unit offers both functions at one location. The appropriate option depends on the task and the credible exposure identified in your risk assessment.

These facilities support an emergency response; they do not replace goggles, face shields, protective clothing or other controls used to prevent exposure in the first place.

Four factors to consider before choosing a unit

•  Exposure risk: Consider the substances in use and whether an incident could affect the eyes, face, a small skin area or much of the body.
•  Fast access: Place equipment where workers can reach and operate it promptly, with a clear path from the hazard area.
•  Flushing supply: Confirm that the installation can provide a suitable water supply and that the equipment remains usable whenever hazardous work is underway.
•  Construction and upkeep: Choose materials appropriate for the environment, then include the unit in routine inspection and maintenance procedures.

For example, a laboratory using small bottles at a bench and a production area transferring larger volumes may have different exposure scenarios. Map each task before choosing equipment: identify where a splash might occur, how the affected worker would reach the flushing point, and whether someone else can help during an incident. Keep that route clear as the workplace layout changes.

Before ordering, check the proposed connection and water supply, the available installation space, and any site-specific requirements. Confirm the selected model’s documentation instead of assuming that specifications or approvals listed for one unit apply to the entire range.

Looking for an emergency shower and eyewash system in Singapore?

View Emergency Showers & Eye Wash Systems

Send an Enquiry to Lee Hung Scientific

Emergency showers and eyewash from Lee Hung Scientific

Lee Hung Scientific offers emergency shower and eyewash models for laboratory and industrial settings. Its emergency shower product page describes an S304 stainless steel shower with an S316 stainless steel ball valve. Check the specifications of the particular model you are considering, especially where site conditions or project requirements call for a specific material or configuration.

If you are planning a new installation or replacing an existing unit, share the chemicals handled, possible exposure areas and proposed installation location with the Lee Hung team. They can help you identify the available models that fit your requirements.

Frequently asked questions

When is an eyewash station needed in Singapore

MOM says an eyewash station or nearby water facilities for quick flushing must be provided where toxic or corrosive chemicals are used and accidental contact with a person’s eyes or body may occur. Review the specific workplace hazards to determine the suitable provision and location.

Should I choose an eyewash, a shower or a combination unit

Consider where a splash could land. Eye exposure calls for an appropriate means of eye flushing; potential exposure over a larger body area may require a shower. A combination unit can be considered where both types of exposure are credible.

How should emergency washing equipment be maintained

Keep access clear and inspect and maintain the equipment according to the manufacturer’s instructions and your workplace procedures. Checks should identify faults or supply problems before the equipment is needed in an emergency.

Explore the available range: Emergency Showers and Eye Wash

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Agriculture and horticulture have become data-driven fields. Visual inspection alone doesn’t cut it anymore not when crop yield, post-harvest shelf life, and export quality are on the line.

Tools like the TEROS soil sensors measure water content, temperature, and electrical conductivity simultaneously, giving growers a complete picture of root-zone conditions in real time. For canopy and light analysis, instruments like the ACCUPAR LP-80 help quantify how efficiently a crop is intercepting sunlight something that directly correlates with biomass and yield.

Post-harvest is equally critical. Ethylene is invisible, but it’s the gas that controls ripening and mismanaging it costs the fresh produce industry billions every year. Portable ethylene analyzers, like the F-900 series, allow storage and logistics teams to catch and control this gas before it triggers premature ripening across an entire shipment. Paired with non-destructive quality meters like the F-750, teams can now estimate dry matter and Brix without cutting a single fruit.

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A laboratory is only as credible as its instruments. Whether you’re running food safety tests, analyzing material properties, or supporting R&D in biotechnology, the tools you use shape the integrity of your results.

Moisture analyzers, water activity meters, spectrophotometers, texture analyzers each of these serves a specific, non-interchangeable purpose. Substituting one for another, or using an uncalibrated unit, introduces error that compounds across every test.

The best labs we’ve worked with share one habit: they treat instrument selection as a scientific decision, not a procurement shortcut.

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For paint manufacturers and quality control labs, measurement isn’t optional it’s the backbone of compliance. Whether you’re testing adhesion strength before a product leaves the factory, or verifying film thickness on a protective coating for marine or industrial use, each test has a direct consequence downstream.

Adhesion failures on coated steel structures don’t just mean rework they mean safety risks. A cross-cut adhesion test or pull-off adhesion tester catches these problems in the lab, not in the field.

Similarly, gloss, color consistency, and surface texture all affect how a product is received commercially. A glossmeter or spectrocolorimeter gives QC teams an objective, repeatable measurement, something a visual inspection can never provide.

Viscosity is another area where small errors compound quickly. The right viscosity cup or cone-and-plate viscometer ensures your paint or ink behaves exactly as formulated, from batch to batch.

The post Paint & Coatings: Where Precision Protects Products and Reputations appeared first on Lee Hung Scientific Pte Ltd.

  
Most people only think about instruments when something goes wrong, a failed batch, an inaccurate reading, a crop that didn’t store well. By then, the cost is already paid.

After decades of working with researchers, agronomists, paint technologists, and food scientists across Singapore and Malaysia, one pattern keeps showing up: the difference between reliable results and frustrating inconsistencies almost always comes down to whether the right instrument was used not just any instrument.

This piece is for professionals who want to make better, more informed decisions about three critical areas: plant and soil analysis, paint and coatings testing, and scientific laboratory work.

The post Why the Right Lab Instrument Changes Everything, A Practical Guide for Science & Industry Professionals appeared first on Lee Hung Scientific Pte Ltd.

Viscometer Applications: Choosing the Right Solution for Your Industry

Viscosity measurement is essential in maintaining product quality, consistency, and process control across many industries. However, different applications require different types of viscometers.

Instead of choosing based on specifications alone, it is often more effective to select a viscometer based on your industry and application needs.

Choosing the Right Viscometer by Application

Food & Beverage Industry

In food production, viscosity directly affects texture, consistency, and product stability. Typical applications include sauces, dairy products, syrups, and beverages.

Recommended solution: Digital viscometers such as the VISCO™ series are commonly used for routine quality control, providing stable and repeatable measurements for daily testing.

Paints & Coatings

For paints, inks, and coatings, viscosity affects application performance, coverage, and finish quality.

Recommended solution: Krebs viscometers are widely used in this industry, offering fast and practical measurements in Krebs Units (KU), which is a standard requirement in many production environments.

Research & Laboratory Testing

Laboratories and R&D environments often require high accuracy and the ability to test small sample volumes.

Recommended solution: Cone and plate viscometers are ideal for precise measurements with minimal sample usage, making them suitable for research and formulation work.

General Industrial Applications

In many industrial settings, viscosity checks are part of routine maintenance and quality control.

Recommended solution: The VT-06 viscometer provides a simple and cost-effective solution for quick viscosity checks, especially in field or production environments.

Key Factors to Consider

• Type of fluid (Newtonian vs non-Newtonian)
• Viscosity range required
• Level of accuracy and repeatability
• Ease of use and testing frequency

Choosing the correct instrument ensures reliable data and efficient operations.

Why Application-Based Selection Matters

• Improve measurement accuracy
• Reduce testing errors
• Ensure consistency in production
• Simplify daily operations

Conclusion

Different industries require different viscosity measurement approaches. By selecting a viscometer based on your application, you can achieve more reliable results and improve overall process efficiency.

If you are unsure which viscometer is suitable for your application, our team at Lee Hung Scientific can assist in recommending the right solution based on your requirements.

Contact us today to discuss your application or request a quotation.

View Product Details

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Why “It Smells Fine” Is Not Good Enough

When haze descends on Singapore, the most dangerous particles are often the ones you cannot see or smell. Fine particulate matter — PM2.5 and smaller — penetrates deep into the lungs and bloodstream. For workers in industrial environments, construction sites, or even open-plan offices, the risk compounds quickly.

PSI readings give you a city-wide average. They do not tell you what’s happening on your floor, in your facility, or in the breathing zone of your team. That is precisely why real-time, on-site aerosol monitoring is no longer a luxury — it is a professional obligation.

And when it comes to aerosol monitors, nothing comes close to the TSI DustTrak™ series .

“The DustTrak DRX is the only monitor that simultaneously measures PM1, PM2.5, Respirable, PM10 and PM Total — no size-selective inlet conditioners required.”

What Sets TSI DustTrak Apart

Most dust monitors give you a single number. The TSI DustTrak™ DRX gives you the full picture — simultaneously measuring multiple particle size fractions in real time. No other monitor on the market does this without additional hardware.

Built for Every Environment

Whether you are conducting occupational hygiene surveys on a worksite, investigating indoor air quality in a commercial building, or running emissions monitoring for environmental compliance, the DustTrak family has a model suited to your application:

• Industrial / occupational hygiene surveys
• Indoor air quality investigations
• Outdoor environmental and emissions monitoring
• Point source and engineering control evaluations
• Remote and process monitoring
• Baseline trending, screening and aerosol research

During haze season, the use cases multiply. Facility managers need to know whether air filtration systems are performing. EHS teams need documentation to support decisions on outdoor work restrictions. Environmental consultants need reliable data to back their assessments. The DustTrak delivers on all fronts.

Don’t Wait for a Health Advisory to Act

The haze we are experiencing today is a reminder that air quality events can escalate quickly and without warning. The organisations that are best protected are those that already have monitoring systems in place — not those scrambling to react after the fact.

The TSI DustTrak™ II and DRX Aerosol Monitors put accurate, real-time data in your hands — so you can make confident, evidence-based decisions for your people and your operations, regardless of what the wind brings in.

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Over the years, I’ve seen facility managers struggle simply because they weren’t using the right monitoring gear. They’re either bogged down by overly complicated tools or using cheap knock-offs that give wildly inaccurate readings.

So, let’s cut through the noise. If you want to actually get a grip on your facility’s environmental data, here is the equipment that realistically makes the daily grind so much easier.

Chasing the Invisible: Particle Counters

You can’t fix what you can’t see, right? When you need to nail down indoor air quality or certify a cleanroom, handheld airborne particle counters are basically your best friends.

If you are doing daily rounds, look into the H8300 and H8500 series (like the H8306 or H8503). These things are fantastic because they pick up particles as tiny as 0.3 microns up to 25 microns right off the bat. The built-in internal pumps run at a steady 0.1 CFM, which does the heavy lifting for you while you walk the floor.

On the flip side, if you are tired of carrying equipment around and need something to sit there and do its job, a remote benchtop unit like the B7301 is the way to go for continuous tracking. You need that immediate feedback to know your filtration systems aren’t failing behind your back.

Stop Guessing Your Airflow

I can’t count the number of times I’ve seen maintenance crews try to estimate ventilation performance by just “feeling the air.” Spoiler alert: it never works.

If you want to balance a system properly and keep energy costs down, you need solid data. The VelociCalc lineup is pretty much the industry gold standard here.

• For the basics: If you just need to check velocity and temperature, grab the VelociCalc 9515. It does the job beautifully without overcomplicating things.
• For tricky ductwork: Stepping up to the 9535 (or the 9535-A with the articulated probe) makes life infinitely better because it actually calculates the flow for you. Trying to reach a weird ceiling vent? That articulated probe is a lifesaver.
• For the hardcore audits: If you are doing full-scale ventilation testing, you need the VelociCalc 9600 Series or the Multi-Function 9565. These units give you velocity, temp, humidity, and differential pressure all at once on a real-time display. It turns a three-hour audit into a forty-five-minute job.

Don’t forget about rotating vane anemometers either. Something like the VelociCalc 5725 is perfect when you need to measure across a larger surface area like a return grille.

Pressure Drops and Hidden Issues

Finally, let’s talk about static pressure. If your pressure is off, your whole system is essentially fighting itself.

Grabbing a solid micromanometer lets you figure out exactly what’s going on inside those ducts. The DP-Calc 5815 is great for straightforward differential and static pressure checks. But if you have to report this data to a client or management, spend the extra bit on the DP-Calc 5825. It comes with data logging, which saves you from scribbling numbers on a clipboard that you’ll inevitably lose. Plus, pair either of these with a Pitot tube, and suddenly you have spot-on velocity readings in really tight, high-heat spaces.

The Bottom Line

Look, the gear you choose heavily impacts your daily routine. Don’t cheap out on the stuff that keeps your environment safe, compliant, and breathable.

If you are based around Singapore or Malaysia and are looking to upgrade your facility’s toolkit, you can find all these heavy-hitters over at Lee Hung Scientific. They carry the reliable stuff so you don’t have to second-guess your measurements.

Stay safe out there, and keep that air clean!

The post The Real Guide to Picking Environmental Ventilation Monitoring Gear (Without Losing Your Mind) appeared first on Lee Hung Scientific Pte Ltd.

Whether you are outfitting a brand-new pharmaceutical testing facility or simply replacing an aging moisture analyzer in a food manufacturing plant, the stakes are incredibly high. You aren’t just buying office supplies. You are investing in precision, compliance, and ultimately, your company’s reputation.

When it comes to sourcing lab equipment Singapore has no shortage of distributors. A quick search will pull up dozens of vendors. But if you’ve been in this industry long enough, you know that buying the equipment is actually the easiest part. The real nightmare starts six months later when that equipment drifts out of calibration, or worse, breaks down entirely during a critical project.

If you want to build a lab that runs efficiently without constant headaches, here is what you actually need to look for beyond the price tag.

Beware the “Box Pushers”

We’ve all seen it happen. A procurement team goes with the absolute lowest bidder for a batch of environmental monitoring tools or testing instruments. The boxes arrive, they get unpacked, and… that’s it. The vendor disappears.

In the industry, we call these vendors “box pushers.” They sell you the hardware, but they don’t understand the science behind it.

If your team is setting up complex gear like Texture Analyser or Water Activity Meter, you need a partner who actually understands the workflow. You want a supplier who provides on-site demonstrations, helps with the initial setup, and trains your staff on the nuances of the software. If a vendor can’t confidently walk you through the operational quirks of the equipment they are selling, walk away.

Calibration is Everything (Look for Accreditation)

Here is a harsh reality: an uncalibrated piece of high-end equipment is essentially an expensive paperweight.

In Singapore, regulatory bodies like the NEA and MOM have strict guidelines, especially regarding environmental and occupational health monitoring. If you are using noise and vibration systems for a construction site or gas detectors in a marine environment, your data must be legally defensible.

This is why you must look at a supplier’s after-sales infrastructure before you buy. Do they outsource their calibration, or do they handle it in-house?

Pro-Tip: Always look for suppliers that are supported by a reliable and established calibration infrastructure. Established local players (like Lee Hung, who have been navigating the local market since the early 80s) often have dedicated testing divisions specialising in areas such as acoustics and vibration. Having direct access to a competent calibration team can significantly reduce downtime and ensure your instruments remain accurate and reliable, allowing your operations to run smoothly.

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