Testo 770-3 Digital Clamp Meter True RMS with Bluetooth selects the correct meter configuration to save time and ensure accuracy with no chance of user error. The Testo 770-3 features automatic shut-off, MIN/MAX/Hold, inrush current capture, watts/power factor, an innovative hook design that separates and grabs wires for easy one-handed use, and a release for wires via its retractable post design.