Integrated circuitry checks moisture content of fluid by measuring the electrical resistance and comparing it with acceptable limits. Easy calibration check using water. Five LED read-out. Just switch on and insert probe for immediate result. Works on all grades of brake fluid. Powered by 1 x AAA battery (supplied). Features & Benefits:Integrated circuitry checks moisture content of fluid by measuring the electrical resistance and comparing it with acceptable limits.Easy calibration check using water.Five LED read-out.Just switch on and insert probe for immediate result.Works on all grades of brake fluid.Powered by 1 x AAA battery (supplied).Model No. VS0274 Specifications: Model No VS0274 Brand: Sealey Nett Weight: 0.05kg