*Suitable for testing DC circuits with
  voltages between 3 and 28Volts.
*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 2 x long life N-sized
  cells.