Hioki PW3360-21-01/500 Power Demand Analyzer Kit (500 A) with Harmonic Analysis and CT9661 Clamps. Hioki Clamp On Power Logger PW3360-21 can record power variations over extended periods of time. An optional SD memory card can be used to record up to one year of measurements at one-minute intervals, providing a useful source of data for verifying energy-saving benefits. Additionally, its broad operating temperature range of -10°C to 50°C, which exceeds that of previous Hioki devices, enables measurement in harsh environments.