The TRUE RMS digital multimeter is suitable for various measurement tasks in the electrical engineering, industrial and service sectors. Multimeters without True RMS measure pure, symmetrical transitions between peaks and troughs while a True RSM device also measures loads from non-linear wave patterns. These come from equipment such as LED lighting, frequency-controlled drives, electronic controls and heating, ventilation and air conditioning systems. Values, measured in the same place, with and without True RMS, can therefore differ and could cause damage and malfunction in the system. Show more