The UT18D voltage tester is a versatile testing device for electrical installation applications up to 690 V. In addition to voltage tests, numerous additional functions are available. The large LCD display can show the corresponding frequency along with the alternating voltage. For direct current voltages, the polarity is determined and displayed. Several other functions complete the wide range of applications of the tester: a phase sequence test in three-phase networks can be performed just as easily as testing residual current devices (RCD/FI test). It can also test the functionality of switching elements, cables, connections, connectors, etc.

AC and DC voltage test 6–690 V, frequency display during AC voltage test 50–400 Hz, single-pole voltage test 100–690 V, continuity or on/off test (0–100 kΩ), phase sequence test 100–690 V, 50–60 Hz, RCD/FI test 230 V, 50–400 Hz, DC polarity test, LED work light, display backlight, additional indication through audible signal, switchable, IP65, overvoltage category CAT III (690 V), CAT IV (600 V), HOLD function, automatic shutdown, battery warning.