Atago 3756 PEN-SW W, Digital Dip Style Salinity Brine Refractometer, PEN Series, Concentration of Salt in Water, 0.0 to 28.0% Measurement Range

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The PEN-SW(W) is suitable for measuring the concentration of salt in water. The unit of measurement is in g/100g. 

Brine is a high-concentration solution of salt (NaCl) in water (H2O). In different contexts, brine may refer to salt solutions ranging from about 3.5% (a typical concentration of seawater, on the lower end of solutions used for brining foods) up to about 26% (a typical saturated solution, depending on temperature). 


ScaleSalinity (g/100g)
Measurement RangeSalinity (g/100g) : 0.0 to 28.0%
(Automatic Temperature Compensation)
ResolutionSalinity (g/100g) : 0.1%
Measurement Accuracy±0.2%
Temperature compensation range10 to 40℃
Ambient Temperature10 to 40℃
Liquid Sample Temperature10 to 100℃
Power Supply1 × Size AAA alkaline battery
Battery LifeAbout 8,000 measurements with new alkaline batteries.
International Protection ClassIP65 Dust-tight and Protected against water jets.
Prism head IP67 Dust-tight and Protected against the effects of temporary immersion in water.
Dimensions & Weight16×3.8×1.8cm, 70g (Main Unit only)

Patent for Design Registration No. ZL200830008615.4 (China), D127363 (Taiwan)
Patent pending in all other countries around the world.

Call 01463 830401 For Any Assistance

One step closer to maximum efficiency

Salinity is the saltiness or amount of salt dissolved in a body of water, called saline water. It is usually measured in g/L or g/kg

New Continuous Measurement feature to expand your current measuring methods.
Fast Measurements ! Non-homogeneous samples - no problem!

Stir the sample while taking continuous measurements until the readings become stable
Easy Continuous Measurements!

Once the START key is pressed, measurements are taken every second


Ergonomically designed for one-handed operation.Protection class of the PEN is IP65 (Prism head IP67). You can rinse off the sample by running water on the prism. The design allows the user to easily wipe off the sample.
The Automatic Temperature Compensation function of the PEN enables you to take measurement readings regardless of the ambient temperature.Revolutionary new feature ELI*
*External Light Interference (ELI) - Patent Pending.
Convenient Storage case.High temperature sample can be measured.
*Do not dip the instrument directly into a boiling pot to measure; instead, place the liquid in a separate container and measure.

    • SKU
    • UPC/ISBN
    • Commodity Codes
  • Measurement Range
    Salinity (g/100g) : 0.0 to 28.0%
  • Resolution
  • Measurement Accuracy
  • Measurement Temperature (°C)
    10 to 100
  • Ambient Temperature (°C)
    10 to 40
  • Use
  • International Protection Class
    IP65, Prism Head is IP67
  • Manufacturer
    Atago Co Ltd
  • Country of Origin