ASTM D5931

Standard Test Method for Density and Relative Density of Engine Coolant Concentrates and Aqueous Engine Coolants by Digital Density Meter.

Get more information about the standard at  ASTM D5931-20.

eradens X

Density & Viscosity Testing
Analyzer in a red and white colored aluminium housing measuring density
fully compliant with ASTM D5931

The smallest D4052 density meter.