• Suitable for testing DC circuits with voltages between 3 and 28V.• No earth clips to get tangled - simply contact the wire to be tested and touch your finger on bare metal ground to get a reading.• Tester illuminates LED, buzzes and vibrates on contacting live wire.• Computer-safe for use around delicate engine management systems.• Supplied fitted with two long-life N-sized batteries.Suitable for testing DC circuits with voltages between 3 and 28V. No earth clips to get tangled - simply contact the wire to be tested and touch your finger on bare metal ground to get a reading. Tester illuminates LED, buzzes and vibrates on contacting live wire. Computer-safe for use around delicate engine management systems. Supplied fitted with two long-life N-sized batteries.• Suitable for testing DC circuits with a voltage between 3 and 28V. • No earth leads to get tangled - simply contact the wire to be tested and touch your finger on bare metal ground to get reading. • Tester illuminates LED, buz