A great addition to any tool kit for someone working on a PC, the Dr. Power III Pro can check a connection for continuity, provide real-time voltage and PG (power good signal) readings, and alert for detected faults with audible and display alerts. Thanks to its compact size of 75mm(W) by 136mm(L) by 25mm(D) you won t be fighting for space in a tool bag while still being easily accessible and protected with the included cloth cover. Audible and display warnings will alert for detected faults.