HT4022 - current tongs for the measurement TRMS of alternating current to 400A, AC/DC of stress, frequency, resistance, electrical conductivity, active reactive, total power, and also capacity rate, energy, cosj, harmonic of voltage and current beside one and three phase networks, the turning of phases with the aid of one wire. Before the cover can be established the probe, which makes it possible to conduct measurements by one hand. [ZHKD] of four sign (10000 units) with the illumination makes it possible to work before the rigid weather conditions. Instrument completely corresponds to the standards: EN 61010-1, CATIII 600V.