Features: Dual Hole Testing: Car spark plug tester is able to dual-hole simultaneous testing as well as analog engine working, which is much more efficient and time-saving. Working Frequency Adjustment Range: Car Spark Plug Tester is designed with adjustable working frequency, the range can reach 0 to 6000rpm. Can be adjusted as you required. Widely Application: 12V gasoline vehicles car spark plugs, 100V-240V input voltage . Shield Design: To ensure the safety of the operators,please cover the protective cover before using. Simple Steps: Place the spark plug in the test hole. Cover the protective cover. Connect the power supply &adjust the working frequency. Observe the spark plug test status through the protective cover. What You Get : 1x Spark Plug Tester. 1x.Charging Adapter. 1x User Manual. Specifications: Item name: Spark Plug Tester Specification: EU/US plug optional Power supply: 100-240V Main unit dimensions: 145x85x113mm/5.70*3.34*4.44in Package dimensions: 165x100x118mm/6.49*3.93*4.64in Weight: 354g/12.48ouce Analog speed: 0-6000rpm Note: Light shooting 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 +/- 10-30mm. Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.