This company has introduced its family of 12 multimeters. The 300 Series features three separate models with built-in AC voltage detection. According to the company, this series allows users to check for the presence of a live circuit prior to attaching the multimeter's test leads to the device. The 400 Series of digital multimeters includes six models. The EX470 model features an AC/DC True RMS model with built-in, noncontact infrared temperature measurement. The other models in the 400 Series range from a basic eight function manual ranging meter to a fully featured, 11 function, autoranging True RMS meter with built-in IR thermometer. The 500 Series is waterproof and capable of measuring voltage, resistance, electrical and electronic frequency functions, and AC/DC current.

Extech Instruments, 285 Bear Hill Road, Waltham, MA 02451; (781) 890-7440; fax (781) 890-7864;