The BESANTEK BSTLT05 Digital Loop and PSC Tester is a handheld microprocessor controlled tester, which includes 3 loop impedance measuring ranges capable of measurements from any point in the installation for comprehensive testing of distribution systems. This model can perform direct measurement of loop impedance without bypassing the wires. The BST-LT05 model offers a built-in voltmeter, ground tester, and loop/PSC tester.