The Amprobe AM-560 HVAC Multimeter is specifically designed for the more demanding HVAC applications. The AM-540 measures a complete range of electrical parameters and key functions such as dual thermocouples for taking differential temperature measurements, low pass filter to take accurate measurements on variable frequency drives and capacitance to check motor startup capacitors. It also features micro amps for flame sensor troubleshooting, and a complete range of electrical parameters. With built-in flashlight and VolTect ™ non-contact voltage detection, the AM-540 is the choice multimeter for a professional HVAC technician.