Anti freeze hydrometer Fast and easy testing the freezing point of water in car tank Protect car use life in cold winter Anti freeze hydrometer testerQL-7051. Glass tube2. Good rubber head and ball, long working life3. Accurate testing of freezting pointof water in car tank 4. length:25cm, diameter:1.9cm,5. Scale: -2--40 Zerone & other methanols,(white),-40--2 Prestone & other ethylene glycols( ...