Atago 2931 MASTER-BC Battery Coolant Fluid Checker Hand Held Refractometer, Plastic Body, Ethylene Glycol. : 0 to -50°C, Propylene Glycol : 0 to -50°C Measurement Range

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This refractometer has an exclusive scale for measuring specific gravity of battery fluid and forchecking the freezing temperature of ethylene glycol and propylene glycol which are used as antifreeze mixture in automobiles, thermal catalyst for solar power systems and other industrial applications.

ScaleFreezing temperature
Battery fluid d20/20
Measurement Range
Ethylene Glycol. : 0 to -50°C
Propylene Glycol  . : 0 to -50°C

1.150 to 1.300
Minimum Scale
Ethylene Glycol . : 5°C
Propylene Glycol. : 5°C

Dimensions & Weight3.2 x 3.4 x 16.8cm, 90g

  •  Daylight plate for small volume samplings : RE-2391-50M
  • Calibration Certificate : Contact an ATAGO representative for details.

  •  Daylight plate : RE-2315-61M

Design Registration No.000379326-0001, 000379326-0002 (EU)
ZL 2005 3 0116403.4,5 (China), D111526 (Taiwan), D555, 549 (U.S.A.),
1255763, 1255764, 1255765, 1255766, 1255767 (Japan)
Patent Granted in countries around the world.

Call 01463 830401 For Any Assistance

Product Line-Up

Reason to choose MASTER series

Water resistant(α & H series)

Water resistant

"Washable". A special design concept for analog type measuring instruments. It is a new mechanism that can be washed even under running water after measurement.



The readability of measured values is the "lifeline" for hand-held refractometer.Not only the brightness of the entire field of view, but also the clarity of the boundaries represents the basis of the optical technology that ATAGO has reached.

Contamination free

Contamination free

Uses a smooth grip with no irregularities. The carbon-like design contributes to both cleanliness and playfulness.

ATC Temperature compensation(α・H・T series)

The measured value are automatically corrected according to the environment. We have thoroughly improved the structure and arrived at a mechanism, patented that is not found anywhere else.

Function and Design


Measurement Method

    • SKU
    • Commodity Codes
  • Measurement Range
    Ethylene Glycol 0 to -50°C, Propylene Glycol 0 to -50°C
  • Body Material
    Plastic body : PBT (Polybutylene terephthalate), resistant to salty and acidic samples
  • Other Features
    M : Low cost model - No IP65, No ATC
  • Use
    Specific Gravity of Battery Fluid, Ethylene Glycol, Propylene Glycol
  • Manufacturer
    Atago Co Ltd
  • Country of Origin