Hand refractometer digital for NDT users

Digital refractometer especially for 1-click percentage measurement of the emulsifier concentration in non-destructive material testing

Programmable electronic refractometer for absolutely safe and reliable measurement results. Very simple 1-click application for fast and effective work.

There are many different types of refractometers. What functionalities should a refractometer have in the field of NDT (non-destructive testing), especially in fluorescent penetrant testing and systems for dye penetrant testing, so that you can work with it as effectively and easily as possible? Refractometer is not just a refractometer. Depending on the specified standards, NDT (non-destructive testing) places particularly high demands on the devices, the measurement and the entire process.

With many years of experience in NDT, fluorescent penetrant testing and also the development and construction of plants and systems for dye penetrant testing, SECU-CHEK offers products specially tailored to the user, which benefit NDT specialists in the rough everyday practice. This has also led to our digital handheld refractometer for NDT experts, which supports you from A to Z and enables you to work as simply and quickly as possible while at the same time providing consistently precise and reliable measurement results.

In addition to the most important features of the various refractometers for NDT, we have also put together an overview that is as comprehensive as possible of all the questions and answers that arise on the subject of refractometers, NDT, fluorescent penetrant testing (FPI), emulsifier concentration and other aspects.

Refractometers for NDT are available in different versions:

  • Hand refractometer or handheld refractometer, mobile refractometer, inline refractometer or process refractometer and much more
  • analog refractometers, digital refractometers
  • electronic refractometers with battery or with mains cable etc.

All refractometers have one thing in common, what they measure: Refractometers measure the refractive index of liquids (refractomy), for example to determine the concentration of dissolved substances in NDT (emulsifier concentration, etc.).

The refractive index of the refractometer is the basic measured value that, depending on the area of ​​application, such as the analysis of the emulsifier concentration in NDT, still has to be converted and adjusted in a time-consuming process so that one can work in compliance with standards such as ASTM. This conversion process in the refractometer is a possible source of error that can be ruled out from the outset by using the right refractometer and at the same time the effort can be reduced to a minimum.

Digital handheld refractometer 800-RM-DP-DR301 for NDT

for quick, safe and reliable determination of the emulsifier concentration

(0-95 Brix)

UNIQUE: the 1-click percentage measurement

The emulsifier concentration is displayed directly in percent (%)

no tedious conversion, no temperature adjustment,…


digital instead of analog: no reading errors due to user interpretation, but consistently exact measurement results

mobile and handy: measure directly in the system with no effort, no additional walking distances

measure and clean quickly and easily

Compliant with all global standards including ASTM, ISO, FDA, NIST, Pratt & Whitney, GE,…

automatic measurement, automatic temperature adjustment/compensation and much more.

Individual programming and calibration by RIL-CHEMIE aligned to your liquids to be examined

incl. individual calibration certificate from our laboratory

Expert advice?

Call +49 6805-942859-0 / Email: info@secu-chek.de

  • Advice from experienced experts
  • Solutions individually tailored to your requirements
  • Price advantage through direct sales
  • Quality Made in Germany

Highlights of the Handheld Refractometer for NDT (800-RM-DP-DR301)

Detailed view of the display on the digital refractometer: the emulsifier concentration is displayed directly as a percentage and is individually adjusted to your emulsifier, in this case the RIL-CHEMIE emulsifier ER-83B

1-click refractometer Display of the emulsifier concentration in percent

  • direct refractometer display: emulsifier concentration calculated in %

  • no waiting: measuring with the refractometer has never been so fast

  • we create an emulsifier concentration curve adapted to your emulsifier, which is programmed and used for the result of the refractometer measurement

  • automatic measurement with the refractometer without time-consuming conversion, absolutely reliable results

  • the refractometer measurement does not depend on the user, absolutely exact results

Perfectly matched to your emulsifier

  • the digital refractometer is precisely adapted to your NDT solutions

  • no matter which manufacturer you get your emulsifier from, every product can be used with this refractometer

  • the individual concentration curve is stored in the digital refractometer

  • e.g. Emulsifier DUBL-CHEK ER-83B and others Emulsifiers for penetrant testing etc.


Refractometer with very high measuring accuracy

  • Electronic refractometers generally have significantly more precise measurement results than analog refractometers

  • The refractive index is in the measuring range 1.3330-1.5318 nD

  • large refractometer Brix scale in the range 0-95 percent

  • Refractometer measurement accuracy: +/-0.00015 nD; +/-0.1% Brix

  • accurate measurement results even with very small samples of 0.3ml

One of the fastest refractometers in the world - measuring result in less than 1 second!

  • Digital handheld refractometer with 1-click measurement

  • No waiting – the end result is visible directly in the digital refractometer display

  • Fast 1-second measurement with maximum measurement accuracy thanks to state-of-the-art refractometer technology


Easiest operation - the all-in-one refractometer

  • Best refractometer for NDT? Yes, because it is so easy to use!

  • At the same time, the sophisticated refractometer technology ensures that errors by the user are almost impossible.

  • Select emulsifier concentration – add sample – measure – done

  • Why all-in-one refractometers? The digital refractometer has a large measuring range and many scales.

  • Brix scale refractometer, salinity refractometer (salt content), Oechsle refractometer, refractive index refractometer and other individually programmable scales

Many refractometer units and scales integrated - open system

  • Display measurement results in different units

  • Refractometer unit: refractive index, Brix, salinity (salinity)

  • Brix measurement refractometer: e.g. can be directly converted as a percentage for the emulsifier concentration

  • In addition to the direct measurement result display of the emulsifier concentration, further application-specific scales can be integrated

  • Open system: refractometer scale conversion, with refractometer Brix conversion table and much more.

ATC Refractometer - Refractometer with ATC "Automatic Temperature Compensation"

ATC-Refraktometer mit Temperatur-Messung

Regardless of whether it is an analogue refractometer or a digital refractometer: the temperature has a decisive influence on the measurement result. Ideally, the ambient temperature, the sample and the calibration solution should be at a constant 20°C. To avoid measuring errors or inaccuracies, a temperature correction must be made at temperatures deviating from 20°C.

What does the ATC refractometer do exactly? At a higher temperature, the volume of a liquid increases, but the weight does not change. This has an effect on the refractive index and must be taken into account when calculating the refractometer.

ATC refractometers for NDT are available in different versions, whereby we generally recommend the electronic, less error-prone refractometer:

  • ATC analog refractometer with “manual” temperature correction: the zero value must be readjusted using the calibration solution.
  • ATC digital refractometer with automatic temperature compensation. Here the digital refractometer does everything in one step

The SECU-CHEK hand-held refractometer for NDT (800-RM-DP-DR301) is an ATC refractometer and, in contrast to analogue refractometers, does all the work for you and thus also prevents possible user errors and measurement inaccuracies, since the temperature compensation takes place automatically and the measurement results are available within approx. 1 second.

Our automatic refractometer (auto-refractometer) includes all relevant functionalities and reduces your process enormously: refractive index refractometer calculator, refractometer correction calculator, refractometer digital with temperature compensation (ATC) as well as including ATC refractometer operating instructions request now!

Refractometer including calibration / certificate

  • Refractometer with calibration certificate

  • Qualification according to all common global standards, including


  • Refractometer labeling: Appropriate according to individual calibration and emulsifier concentration used

  • Also pay attention to a qualified UVA lamp in color penetrant testing for optimal results

Further advantages and useful features of the SECU-CHEK NDT hand refractometer

Fast on-site analysis

  • regardless of whether it is in front of the emulsifier sink of your system for dye penetrant testing, the Test cabin or in the laboratory

  • Measure the refractive index, Brix value or directly the emulsifier concentration anywhere at any time

  • Handy, mobile and lightweight – that’s what distinguishes our NDT refractometer (ATC)

Easy filling and cleaning

  • Fill quickly and easily with the pipette

  • suitable for all NDT liquids and samples

  • Cleaning the refractometer: very easy (stainless steel recess for sample entry)

Intuitive operation and easy-to-read display

  • modern touch screen display, shortcut keys

  • Intuitive menu, with different languages (DE, EN, ES, FR,…)

  • Display of several refractometer readings, large display

Digitally networked

  • Refractometer with USB interface

  • Measurement data stored digitally in the refractometer and retrievable

  • Digital refractometer with software for programming and interfaces

Monitoring signals for limit values

  • digital refractometer with alarm option

  • when a defined limit value is exceeded, the signal is given

High quality

  • mobile refractometer with small dimensions and only 500g total weight

  • robust stainless steel tray for sample input

  • IP 50 protection, dimensions only 18x10x6cm (WxHxD)

Battery operated / AC adapter

  • Battery refractometer: mobile use with 9V block battery

  • portable refractometer including power pack

  • flexible: operate the refractometer with a battery or in the laboratory with a power pack

  • Electronic refractometer with stable power supply and long running time

Operating instructions / instructions for use

  • Refractometer instruction manual is included

  • Refractometer Instructions: Commissioning and Maintenance

  • Refractometer operation and programming

  • Refractometer application: read the refractometer correctly

  • Refractometer ATC instructions: compensation factor, etc.

  • ATC Refractometer Digital Refractometer User Guide

Refractometer specifications

  • Refractometer scales: refractive index (nD), concentration of sucrose, glucose, fructose, invert sugar [%Brix], salinity [‰], user-defined

  • Refractometer measuring prism: optical glass

  • Refractometer with 589 nm wavelength and LED light source

  • Refractometer ATC temperature compensation 10-40 °C

  • Refractometer temperature measurement accuracy +/- 0.5 °C at 0.1 °C resolution

  • Refractometer with 589 nm wavelength and LED light source

Expert advice?

Call +49 6805-942859-0 / Email: info@secu-chek.de

  • Advice from experienced experts
  • Solutions individually tailored to your requirements
  • Price advantage through direct sales
  • Quality Made in Germany

Which emulsifiers can be used well in the area of PT penetrant testing in connection with refractometers?

Refractometer comparison: What types of refractometers are there? Refractometer types overview.

Digital refractometer especially for 1-click measurement of the emulsifier concentration in NDT. Eyedropper view. Refractometer to determine the emulsifier concentration.

Refractometer types: there are many different types of refractometers geared to the respective area of ​​application. A basic distinction can be made between analog refractometers and digital refractometers.

Traditional hand refractometers easily fit in a trouser pocket, the measurement is analog, i.e. using an optical prism and reading the scale (refractive index). Digital hand-held refractometers use an optical sensor to measure the refractive index, which records the reflection of the light from an LED light source. Both types of refractometers can work with different scales such as the refractive index (refractive index, Brix scale, salinity (salt content), etc.), whereby the digital refractometer takes a few measuring steps and conversion steps and is therefore less prone to errors.

Which types of refractometers are used in Germany, but also worldwide?

Digital and analogue refractometers for laboratories, process refractometers or inline refractometers, test refractometers, Brix refractometers, portable refractometers, differential refractometers, multi-parameter refractometers, refractometers analog with refractometer correction table

Examples of types of refractometers are: handheld refractometers, Abbe refractometers, Pulfrich refractometers, Wollastons refractometers, Jelley refractometers

Refractometer price: if you make a refractometer comparison and compare the different models, you can basically say the following: simple analog models are often available for less than 100 EUR, while digital refractometers and laboratory refractometers, depending on the version, can quickly be found in three and land in the four-digit range.

Searches are often made with terms such as “refractometer price”, “refractometer Germany”, “price refractometer”, “hand refractometer price”, “portable refractometer price” or “stationary refractometer price”. Don’t save in the wrong place. Let us advise you so that you can order a refractometer that is optimally suited to your application.

How important are exact measurement results for you and your application?
How often does it need to be measured? Which standards and certifications must be complied with?
Rely on quality and simplicity in your daily work.

The SECU-CHEK refractometer for NDT reduces your process enormously because it takes care of all calculations including ATC temperature adjustment in one step within one second. Contact us for a refractometer offer!

Non-destructive material testing (NDT) and dye penetrant testing is an area in which a high level of quality and reliability is required, especially in the aviation industry and other safety-related industries. RIL-CHEMIE has been a specialist supplier of NDT technology for years. As a system provider, we advise you from the ground up so that you can optimally use all types of NDT such as red-white testing, PT penetrant testing, fluorescent penetrant testing, visual inspection, magnetic particle testing and much more with the appropriate measuring devices, systems and tools. can implement safely, reliably and efficiently.

Refractometer FAQ - Frequently asked questions and answers about refractometers

What is a refractometer? What is measured with a refractometer?

Refractometer Definition: The refractometer is a measuring device for determining the refractive index of – liquid or solid – transparent materials by refractometry. This is the best explanation, detailed information can be found here (Refractometer Wiki)

What can you measure with a refractometer? The refractive index, also called optical density or refractive index (source including physical details here)


What are the areas of use and areas of application for refractometers?

Refractometer Applications: Measuring the emulsifier concentration in penetrant testing (PT penetrant testing), a subcategory of NDT (non-destructive testing). Measure sugar content in grapes, fruit, etc. Measure alcohol content in a sugar or alcohol solution. Identification of unknown substances. measure salinity. Clinical Applications. Automotive applications such as measuring the freezing point of coolants. Determination of precious stones. Pharmacy, chemical industry, aviation, metal processing and building technology, food industry, and much more.

How does a refractometer work? Refractometer measuring principle / refractometer structure / refractometer function

Refractometer principle: Due to the different optical densities (refractive index) of different liquids, a light beam propagates at a different angle when it hits the liquid. This angle represents the refractive index, which can then be used to infer certain properties (e.g. different concentrations).

Structure of a refractometer: in its simplest form, a refractometer has a light source, a prism onto which the sample is placed and then an optical sensor (digital refractometer) or the human eye (analogue refractometer) with which the angle of refraction is then determined.

Refractometer function: The way a refractometer works is that a beam of light from a light source hits a sample (e.g. emulsifier solution in dye penetrant testing) through a prism and is partially refracted or partially reflected. The angle required to calculate the refractive index is found at the boundary between the light and dark areas.

Calibrate refractometer / Set and adjust refractometer / Calibrate ATC refractometer

A refractometer should be calibrated regularly. To do this, the refractometer calibration liquid (often distilled water) should be applied to the optical prism at a temperature of 20° Celsius. Attention: Depending on the calibration liquid used for the refractometer, there are different reference values.
Now it is checked whether the limit line at the refractometer is on the correct value. If so: the refractometer is set correctly, i.e. correctly calibrated. If not, you must readjust the scale and set it to the correct value. Ready. (More information about calibrating the refractometer and different reference values ​​can be found here)

Calibrate ATC refractometer: with digital refractometers, the calibration is done by the device itself.


Refractometer correction table / Refractometer ATC temperature correction / Refractometer conversion table

The official conversion table or correction table for refractometers for temperature adjustment can be found here (p.9/p.10):


Note: good digital ATC refractometers do the automatic temperature compensation automatically, so you don’t have to do the conversion yourself. Let us advise you.


Which norms and standards are important for refractometers, especially for NDT refractometers?

Aviation industry: NADCAP 7114-11, AMS 2644 and QPL-AMS-S 2644, NIST (National Bureau of Standards, USA) and many more.

Example: NDE during Manufacture and Maintenance of Aircrafts and Helicopters


Cleaning of refractometers, maintenance of refractometers, especially laboratory refractometers

Hand refractometer: clean the optical prism with a soft cloth, do not scratch the surface of the prism. Before the measurement, the prism or the sample trough should be completely cleaned. After the measurement, clean the prism with a damp, soft cloth.

Refractometer maintenance: If you want to have a refractometer calibrated or recalibrated and maintained, please contact us.

We look forward to your inquiry!

You are also welcome to contact us by phone or email.

    Direct contact:

    An der Fähre 9
    66271 Kleinblittersdorf

    Phone +49 6805-942859-0
    Fax +49 6805-942859-95

    Email: info@secu-chek.de

    Google Maps

    By loading the map, you agree to Google's privacy policy.
    Learn more

    Load map