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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
One step closer to maximum efficiency
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).
Specifications
Model | PEN-SW(W) |
---|---|
Cat.No. | 3756 |
Scale | Salinity (g/100g) |
Measurement Range | Salinity (g/100g) : 0.0 to 28.0% (Automatic Temperature Compensation) |
Resolution | Salinity (g/100g) : 0.1% |
Measurement Accuracy | ±0.2% |
Temperature compensation range | 10 to 40℃ |
Ambient Temperature | 10 to 40℃ |
Liquid Sample Temperature | 10 to 100℃ |
Power Supply | 1 × Size AAA alkaline battery |
Battery Life | About 8,000 measurements with new alkaline batteries. |
International Protection Class | IP65 Dust-tight and Protected against water jets. Prism head IP67 Dust-tight and Protected against the effects of temporary immersion in water. |
Dimensions & Weight | 16×3.8×1.8cm, 70g (Main Unit only) |
Patent for Design Registration No. ZL200830008615.4 (China), D127363 (Taiwan)
Patent pending in all other countries around the world.

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 | ![]() |
Features
![]() | 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. |
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Measurement RangeSalinity (g/100g) : 0.0 to 28.0%
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Resolution0.1%
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Measurement Accuracy±0.2%
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Measurement Temperature (°C)10 to 100
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Ambient Temperature (°C)10 to 40
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UseSalinity
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International Protection ClassIP65, Prism Head is IP67
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ManufacturerAtago Co Ltd
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Country of OriginJapan
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