Voltage Tester A voltage tester lets you assess the efficiency, durability and working conditions of lots of different electrical appliances and they are an invaluable tool for many workers involved in construction and trade industries. But it’s not just professionals who can make use of them. In fact, homeowners and DIY enthusiasts often use them to carry out their safety checks too. Our voltage tester lets you check the voltage levels of AC and DC circuits and determine both short and open circuits. You can also look for polarity issues and test for the presence of live volts - a great accessory for professionals and enthusiasts alike.