Brake fluid pencil tester

Electronic brake fluid tester.
Checks the amount of water contained in the brake fluid being tested.
Can be used with DOT 4 brake fluids.
Five LEDs indicate the approximate amount of water in the tested fluid: 0%, 1%, 2%, 3%, 4%.
Made of reinforced fibreglass thus avoiding any premature wear or damage to the device owing to contact with the brake fluid.
Contains one 1.5V AAA type battery.
Dimensions: 8.7cm x 2.8cm x 1.18cm (L x W x H)