CM3289 AC Current Clamp MeterHioki clamp meters are best in class measuring devices incorporating Hiokis expertise in current sensing technology. The CM3289 is a True RMS rectifying 1000A AC clamp meter that features a broad operating temperature range of 25 to 65C, a thin and compact clamp core, and an optional flexible current sensor that you can attach to let you get into the tightest spots. FEATURES Expanded 25 to 65C operating temperature range Measure even harmonic waveform