ZK-103 Car Multi-functional Drive Test Pen DC6-24V Circuit Tester 1. A good tool for the auto electrician and mechanic. 2. Carry out the tests on systems from 6V up to 24V quickly and efficiently. 3. Polarity test: power up components prior to fitting including cooling fan motors fuel pumps windowsunroof motors relays and lamps wiper motors 4. Tests continuity in switches diodes and fuses relays wiring harnesses 5. Detect short circuits. 6. Locate bad earths quickly. 7. Fitted with a sensitive short circuit protection device. 8. Safe to use around vehicle electronic management systems. 9. Fitted with 4.5mtr cable allowing access to the rear of the vehicle and supplied with instructions. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store