Why won't the PR300 display change?

If the PR300 will power on, but doesn't respond when pressing the buttons, check the power supply and make sure it's being powered by 130-300 VDC or 100-240 VAC.

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Power Analyzers and Power Meters

Measure characteristics of devices that generate, transform or consume electricity. Also called power meters or wattmeters, these devices measure parameters such as true power (watts), power factor, harmonics, and efficiency.