Atago 3757 Digital Dip Style Salinity Brine Refractometer , PEN-SW(WV) PEN Series, Salinity (g/100mL) : 0.0 to 33.0% Measurement Range

One step closer to maximum efficiency 

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

Model PEN-SW(WV)
Cat.No. 3757
Scale Salinity (g/100mL)
Measurement Range Salinity (g/100mL) : 0.0 to 33.0%
(Automatic Temperature Compensation)
Resolution Salinity (g/100mL) : 0.1%
Measurement Accuracy Salinity (g/100mL) : ±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.

Quantity Break Pricing:
1 items £465.00 / each  
2-4 items £418.50 / each save 10%
5-9 items £348.75 / each save 25%
10 or more items £325.50 / each save 30%
  • £465.00

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 enable 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/100mL) : 0.0 to 33.0%
  • 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

Icons, for functions, specifications and scales have been added to this catalogue

Can be connected to a recorder Measurement at a set temperature
Can be connected to a printer Automatic Temperature Compensation
Alarm output for high- and low-limit values Can be connected to a circulating
RS232C Interface Continuous measurement
In-line measurement High temperature samples
User scales can be inputted External Light Interference


Specification Scale
Calibration with water Clinical refractometers
Calibration with exclusive standard liquid Refractive index scale
Compact and easy to carry Salt concentration scale
Digital display Seawater scale
AC outlet (AC100 to 240V) Wine scale
Battery operated

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