Non-Contact Voltage and Magnetic Field Detector: AC Voltage Ranges 24 to 1000V & 90 to 1000V - (ET350)The Triplett Model ET350 (for US use) combines a Non Contact Voltage and a Magnetic Field Detector. Read More > DESCRIPTION The Triplett Model ET350 (for US use) combines a Non Contact Voltage and a Magnetic Field Detector. It has dual AC voltage ranges: 24 to 1000V and 90 to 1000V with high sensitivity that allows it to detect low voltage AC wiring commonly found in doorbell circuits, thermostats, control circuits, and video surveillance camera