Draper-Brake-Fluid-Tester-Draper-59078-Specially-designed-for-checking-the-moisture-content-in-brake-fluid-Comparative-electrolyte-type-tester-which-passes-current-through-the-fluid-&-measures-any-resistance-present-Simple-to-calibrate-very-easy-to-use-&-read-with-an-audible-test-cycle-Adjustable-test-probe-for-easy-access-Uses-1-x-9V-battery-PP3-sold-separately-Display-packed-Draper-Brake-Fluid-Tester