Supports most Zeners, Avalanche diodes and reference diodes from 0V to 50V, large for VDRs testing, TVSS and other types of voltage protection devices. Selectable test currents: 2mA, 5mA, 10mA and 15mA Also ideal for measuring the forward voltage of the diodes (including the HV/EHT diodes which can have very high forward voltage drops). Tiny tactile ratio of test current heating of your component itself when tested at 50 V and 15 mA. Measures breaking voltage (0.00 V to 50. 00 V) with a resolution as fine as 20 mV. Measures slope resistance (up to 1k and OHgr; at 15mA with a 1Ω resolution). Single alkaline AAA battery (included). Long battery life and regulated test conditions even when the battery voltage is as low as 1.0 V, test voltages are below in the low voltage directive 2006/95/EC. Continuous measurement display (updated 3 times per second) Measurement "hold" function to keep displayed values even when component is removed. Equipped with gold-plated crocodile (alligator) clips. Very extensive printed instruction manual (English language not guaranteed).