The Power-Mate Lite 10A power meter is capable of measuring the AC (alternating current) voltage of any appliance it is plugged into.
When 'zoomed in' on the display screen, both Minimum and Maximum values are logged and displayed for True and Apparent Power, and also for Volts and Amps.
The Min and Max values are only logged during a measurement period (when the Power Mate is 'running') and can be cleared by holding the Run button. This is explained in more detail in the user manual that ships with the product.