The Power Probe PWM Adapter allows technicians to create a pulse width modulation (PWM) signal to test components on modern vehicles. The tool connects in line with the lead probe on any Power Probe (PP3/PP3EZ/PP4/Maestro) to change the signal from a steady 12V output to a selectable PWM signal. The PWM range is 5 percent to 100 percent, in 1 percent increments. Newer vehicles use PWM control to change speeds on items like blower motors, cooling fans, fuel pumps, and AC compressors. The Power Probe PWM adapter gives technicians a way to safely and accurately measure these components.