Profile: G & W Instrument Co., Inc. supplies hydrometers, floating thermometers and various other glass scientific instruments. We provide hydrometers, and thermo hydrometers for the petroleum industry, & brix hydrometers for sugar processing. We are an ISO 9001 certified company. Our products are used in brewing industry, both for home brewer & commercial applications. We also manufacture our instruments with thermometers. Our hydrometers have a directional device which stops the instrument from moving. Our ASTM55HL thermo hydrometer is used in petroleum industry for refining crude oil into gasoline and fuel oil. Our specific gravity light hydrometer is used in the chemical industry for liquids that are lighter than water. Our AATM84H is used in both petroleum and chemical industry where precise measurements are necessary.