HB Instruments Inc. Hydrometers Baume, Brix, API, ASTM, Proof, Nist Traceable Thermometers Humidity Datalogger, Infrared, Digital, Spirit-Filled Glass Stem, Mercuty-Filled Glass Stem, Nist Traceable. Thermometers with Trade names Double-Safe®, Easy-Read®, Enviro-Safe®, FRIO-Temp® Weather Instruments