• Enables fast diagnosis of glow plug failure or degradation without the need to disassemble the plug from the engine.• Suitable for use on any 12V DC glow plugs and connects directly to the vehicle’s battery.• Features six LED read-out which indicates glow plug status and also whether battery contains enough charge to power the plugs.Enables fast diagnosis of glow plug failure or degradation without the need to disassemble the plug from the engine. Suitable for use on any 12V DC glow plugs and connects directly to the vehicle’s battery. Features six LED read-out which indicates glow plug status and also whether battery contains enough charge to power the plugs.• Enables fast diagnosis of glow plug failure or degradation without the need to disassemble the plug from the engine. • Suitable for use on any 12V DC glow plugs and connects directly to the vehicle's battery. • Features 6 LED readout which indicates glow plug status and also if battery contains enough charge to power the plugs