MERCURY CONTAINING DEVICES Used For: Used to measure the density of liquids. Product: Twaddel Hydrometer Observed Uses: Found in dairies, breweries, medical labs and commercial kitchens. Mercury Content: Approximately 8 grams. Notes/Comments: Fragile. Non–mercury alternaves exist. Source: Todd Dresser, CHMM, TURP hps//www.linkedin.com/in /todddresser