Comparative electrolytic type tester. Checks moisture content of fluid by resistance to electric current. Easily calibrated using new brake fluid. Audible test cycle with three LED read-out. Just insert probe and press button for immediate result. Works on DOT 3, 4 and 5.1 specification fluids. Powered by a 9V battery (not included). Features & Benefits: • Comparative electrolytic type tester. • Checks moisture content of fluid by resistance to electric current. • Easily calibrated using new brake fluid. • Audible test cycle with three LED read-out. • Just insert probe and press-button for immediate result. • Works on DOT 3, 4 and 5.1 specification fluids. • Powered by a 9V battery (not included). • Model No. VS027 Specifications: Model No VS027 Brand: Sealey Nett Weight: 0.18kg