Model HT579 it is intended for the measurement TRMS: stress AC/DC out of 1000[V] and current DC/AC to 10 A, measurements of temperature, determination of harmonics beside % the distortions coefficient OF THD% has the built-in system of the decrease of noise ACE with the measurements of direct current. Instrument corresponds TO CAT THE III -600 V, CAT II -1000 V based on Class 2 protection according to [E]N 61010-1. HT576 does have large [ZHKD] 3? number (4000 units) with the analog scale.