Full Size Hydrometer Battery Tester, Designed to test the concentration of the battery acid in non-sealed batteries. Larger Print Easier To Read, accurate indications on battery charge status and battery condition. Plastic Construction For Commercial Applications. Professional Quality For Highest Accuracy. Precision Graduated Specific Gravity Float. Full Size Hydrometer Battery Tester,Larger Print Easier To Read, Plastic Construction For Commercial Applications,Professional Quality For Highest Accuracy,Precision Graduated Specific Gravity Float