Best Coolant Tester Hand Held Refractometer, 0 32 BRIX Scale for General Purpose Use

https://www.penntoolco.com/precise-coolant-tester-hand-held-refractometer/

Precise Coolant Tester Hand Held Refractometer
Quickly and easily test cutting fluid concentration.
Save on coolant and tool wear by manufacturing proper dilution.
Complete easy to use instructions and case included.
Can also be used to check the coolant of a car.

Coolant Tester Hand Held Refractometer - 0-10% (BRIX Scale) Use for low concentrations and synthetics. Includes auto temperature compensation

Coolant Tester Hand Held Refractometer, 0-32% (BRIX Scale) Ideal for General Purpose Use