Electrical power testing devices ensure power systems and equipment operate reliably and safely, and reduce maintenance downtime. Digital multimeters use test leads to measure voltage, current, and resistance in circuits, components, wall outlets, and other electrical devices and are ideal for field service work. Clamp meters fasten around or surround conductors to measure electrical current in live circuits to test and troubleshoot electrical equipment. Megohmmeters measure the electrical resistance of insulators such as cable jackets, electrical wires, and motor windings to determine current leakage and identify faulty or damaged insulation. Test leads connect electrical testing equipment to the testing object to provide safe and accurate test results. High-voltage detectors and voltmeters measure and monitor high voltage equipment to make sure current flow is at the correct levels.