<p>DGP301 Glow Plug Tester provides fault detection thru LED's for a quick analysis of short circuit over current normal operation and open circuit\/under current</p> <p>Tester allows for testing without removing glow plug from engine and powers the glow plug to test the plug in its operating state</p> <p>Much more accurate test than a cold resistance test which can miss short circuits</p> <p>Tester uses a current measurement to accurately determine proper operation and check for short circuits</p> <p>OPERATING INSTRUCTIONS:</p> <p>Designed To Work On 12V ONLY !</p> <p>Disconnect the busbar or leads from the glow plugs to be tested;</p> <p>Connect the RED battery clamp to the positive terminal of the battery, and the BLACK battery clamp to the negative terminal of the battery;</p> <p>Push the contact plate in of the test probe onto the glow plug;</p> <p>Terminate until the glow plug has warmed up. This might take between 3 and 20 seconds (Check manufacturers specs for exact warm-up time)</p> <p>Check which LED is illuminated on the control panel;</p> <p>NOTE:Even all 4 glow plugs are open circuit, DO NOT assume this tool is faulty. The vehicle might be still started up with all 4 glow plugs being defective.</p> <p>Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use.</p> <p>Colour:Black</p> <p>Material:Plastic</p> <p>Package Contents:</p> <p>1 * Tester</p> <p>Only the above package content, other products are not included.</p> <p>Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.</p>