Non Mercury ThermoHydrometer ASTM S555HL 39/51 API 0.1 API Divisions, 0/150°F, 2.0° divisions, 380mm lgth. Supplied with NIST traceable, ISO/IEC 17025 accredited report of calibration for the hydrometer portion at 3 points per ASTM E2995-14 and E-126 specifications and the thermometer portion at test points at 32 & 100 °F. Non-Mercury ASTM Precision Thermohydrometers per ASTM E2995-14 ‘Standard Specification for ASTM Thermohydrometers with integral Low-Hazard Thermometer’ These high precision thermo-hydrometers are manufactured by Ludwig Schneider GmbH & Co. KG in Wertheim, Germany. Safe and Easy cleanup in case of breakage!