Brake Fluid Tester W/ L.E.D. DOT3/4 /5.1

Size: approx. 15cm/5,9'' Power supply: (1) AAA Battery (not Included) HOW TO USE 1) LED'S Indicating the water %percentage in the Brake Fluid. 2) 0% LED Indicates that battery in the tester is OK. 3) 1% LED indicates that moisture content of brake oil is less than 1% ( fluid is acceptable. 4) 2% LED indicates moisture is less than 2% ( fluid can be used and checked again during next maintenance).  5)3% LED indicates moisture is less than 3% (fluid should be changed soon) 6) 4% indicates moisture is less than 4% ( FLUID SHOULD BE REPLACED IMMEDIATELY).