Skip Content


1.6" Coolant/Battery Acid Portable Coolant Refractometer

  • Item # 3MY57
  • My Part #
  • Mfr. Model # RF40
  • Catalog Page # 626
  • UNSPSC # 41115313
1.6" Coolant/Battery Acid Portable Coolant Refractometer close

Using 360° Viewing:

  1. Rotate: Use top-to-bottom, side-to-side by use of mouse arrow.
  2. Zoom In: Double click on image.
  3. Zoom Out/Reset: Put photo at full zoom & then double click.

CAD Downloads

Web Price $89.99 / each
Activate Now

to save with

Select AdvantageSM

Please sign in or register to access lists

Please sign in or register to access Quote

Want to Get Free Shipping?

  • Shipping Weight 0.9 lbs.
Country of Origin China Country of Origin is subject to change.
Note: Product availability is real-time updated and adjusted continuously. The product will be reserved for you when you complete your order. More

Product Details

Measures the concentration of dissolved solids for a wide range of applications including food processing, laboratory, and machine cooling. Easy-to-operate instruments provide quick scale readings.

View More

Technical Specs

  • Item Portable Coolant Refractometer
  • Type Coolant/Battery Acid
  • Range -60 Degrees to 32 Degrees Propylene Glycol Freeze Pt., -50 Degrees to 0 Degrees Ethylene Glycol Freeze Pt., 1.15 to 1.30 Spec. Gravity of Battery Acid
  • Automatic Temperature Compensation Yes
  • Accuracy +/-2%
  • Resolution 2 Degrees F, 0.01 specific gravity
  • Function Measures the Freezing Point of Coolants and the Charge Condition of Batteries
  • Specific Gravity 1.15 to 1.30 (Battery Acid)
  • Freezing Point "-60 Degrees to 32 Degrees F Propylene Glycol, -60 Degrees to 25 Degrees F Ethylene Glycol
  • Features Automatic Temperature Compensation
  • Length 1.6"
  • Dia. 1.2"
  • Includes Carrying Case, Calibration Screwdriver and Instructions
  • Manufacturers Warranty Length 1 yr.
How can we improve our Technical Specifications?

Compliance and Restrictions


Alternate Products

Alternate Products may not be identical in style or function to original selection. Please compare below for more information.

Alternate Search Terms

Customer Reviews

1.6 In Coolant/Battery Acid Portable Coolant Refractometer is rated 5.0 out of 5 by 3.
Rated 5 out of 5 by from Very good product for this price point. Easy to use!
Date published: 2013-12-18
Rated 5 out of 5 by from I used the Extech Refractometer (FR40) to check Propylene Glycol. Quick,accurate and easy to use. Well built with storage case.
Date published: 2013-06-05
Rated 5 out of 5 by from Very easy tool to use and read. Used it several times with accurate readings. Best part no batteries.
Date published: 2012-11-28
  • y_2018, m_6, d_22, h_19
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.8
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_3
  • loc_en_US, sid_3MY57, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING), SortEntry(order=FEATURED, direction=DESCENDING)]
  • clientName_grainger

Product Reviews Disclaimer:
Grainger is neither responsible for, nor does it endorse, the content of any product review or statement posted. Any statements posted constitute the statements of the poster and are not the statements of Grainger. The statements posted by Grainger employees with the Grainger employee badge represent the views of such employees and are not the statements of Grainger. Grainger makes no representations as to the appropriateness, accuracy, completeness, correctness, currentness, suitability, or validity of any product review or statements posted, including those posted by employees with the Grainger employee badge, and is not liable for any losses, injuries or damages which may result from any such product review or statements. Use of any linked web site provided in a product review or post is at the user's own risk.