* Professional quality, heavy-duty tester. * Features colour-coded, 6 LED display, showing battery and alternator voltages. * Suitable for 12V systems. * No internal battery required.

* Designed to test low voltage glow plug operation on modern diesel engines. * Prevents glow plug damage caused by testing with the vehicle battery. * Glow plugs can be tested whilst in situ. * Supplied in storage case with instructions. * Requires 9V battery (not supplied).