The CanDo Glow Plug Reader features a comfortable, ergonomic design for ease-of-operation, built-in LEDs for testing in low-light conditions and an easy-to-read screen with actual-condition and glow plug resistance-value graphic display. The reader is self-calibrating with audible tones for high-resistance, shorted and other glow plug performance conditions. The reader has multi-voltage testing for all voltage ratings including ceramic-type glow plugs. Save time and money by not having to remove glow plugs for testing. It also has an automatic shut-off when not in use and a low-battery warning indicator.