Sperry 27 Range Digital Clamp-On MeterEngineered to exceed the expectations of the professional electrician the DSA1020TRMS is a 10 functional 27 range digital snap around clamp meter with precise true RMS circuitry and a 1000 AMP non contact current reading. Designed with integrated non contact voltage detection and a min max data hold capable function which allows you to hold either minimum reading or maximum reading on the display. This auto ranging unit features 10 functions and 27