Hioki clamp meters are best-in-class measuring devices incorporating Hioki s expertise in current sensing technology. The 3280-10F is an average rectifying 1000A AC clamp meter that features a broad operating temperature range of -25C to 65C, thin and compact clamp core and optional flexible current sensor that you can attach to let you get into the tightest spots. Measure the fundamental waveform component using the average rectified method. Expanded -25 C to 65 C operating temperature range. Connect the CT6280 flexible sensor to measure up to 4199 A in thick or paired wires. Drop proof design withstands drop from a height of 1 meter