①. Wide range of applications: The EM285 circuit tester can be used to test continuity, check the polarity of a voltage, inspect lamps, test electric motors, locate short circuits, and check for bad ground contacts, etc. ②. Long test lead: The cable length is approximately 16ft, which facilitates testing of various electrical systems. ③. Short-circuit protection: The unit is equipped with short-circuit protection and can quickly check for bad ground contacts. ④. Easy operation: After simply connecting the unit to the vehicle's battery, automotive technicians can apply positive or negative battery current to the tip by toggling the switch forward or backward. ⑤. Comprehensive 6-24V DC test kit: Not suitable for AC voltage. ⑥. Operation Instructions: Unroll the unit's cable; connect the red clip to the positive terminal of the vehicle's battery; connect the black clip to the negative terminal of the vehicle's battery. ⑦. Operation Voltage: 6-24V DC. ⑧. Overload Protection: 8A (When the current exceeds 8A, the device will automatically disconnect the current). ⑨. Colour: Black + Red. ⑩. Material: Plastic + Metal. ⑪. Package Contents: 1 * Circuit Tester. Only the above package contents are included; other products are not provided. ⑫. Note: Due to light and different display factors, the color of the item may slightly differ from the actual product. The allowed measurement error is +/- 1-3cm.