battery hydrometer tester 1. glass tube 2. good quality rubber head and ball 3.fast and accurate testing of battery condition QL-7048" Battery hydrometer tester1. Glass tube2. Good rubber head and ball, long working life3. Accurate testing of battery condition4. length:28cm, diameter:2.3cm,5. Scale: 1100-1300, Red (recharge):1100-1225, White(Fair):1250, Green(Good):1275-13006.packing: blister ...