The 1 SPOT mA Meter is a simple device for measuring the power consumption of your guitar pedals. The mA Meter showing you how much current your DC powered pedal really needs. Input voltage range is 9-24 V dc, max current displayed is 999 mA. No more scouring the Web for information about your pedals that might not even be accurate. Just plug your pedal into the mA Meter and see for yourself how much power it needs! And as an added bonus, it offers a cable tester.