I highly recommend these to anyone who cares about their equipment since installed I have been able to move the probes around the vehicle and find every single drop in voltage and accommodate making my setup more efficient and unfortunately this last weekend I blew my amp and was sitting in the driver seat watching it happening in real time with the HPVM and was able to shut everything off in time to save the rest of my equipment so so happy I bought this volt meter and will definitely have an array of LF Audio products installed before it's over with