This tool tests the polarity instantly, locating short circuits without wasting fuses and finds bad ground/earth contacts. Test polarity without connecting jumper wires. Tests include: Cooling fans, window regulator motors, electronic fuel pumps, relays, lamps etc. Computer safe for use around sensitive engine management systems

• Locates short circuits.
• Finds bad ground/earth contacts.
• Test polarity without connecting the jumper wires.
• Instant testing saving time.
• CE and RoHS compliant.