The professional current clamp HT4022 offers you true RMS measurements (TRMS) for AC current up to 400 A and AC / DC voltage as well as resistance, continuity and frequency measurement. In addition, these models measure active power, reactive power, apparent power, power factor cos and energy, both in single-phase and symmetrical three-phase systems, as well as the determination of the rotating field direction - with an innovative, patented method based on only one test probe. Thanks to the practical (also patented) rubber protective cap with a connector for a test probe, it is possible to take measurements quickly and easily with just one hand. Thanks to the large 4-digit LCD display (10,000 points) with backlighting, easy reading is guaranteed even under difficult conditions. The device complies with the requirements of EN 61010-1 in CAT III 600 V. Suitable for conductors up to max. 30 mm diameter.