Checks the polarity of the plug from a power supply.
Display shows the polarity as centre positive, centre negative or AC.
Works with battery packs, power supplies, plug packs or any other voltage device with an output range of 3-15V AC/DC.

Specifications:

• Voltage range 3V - 15V.
• No battery required.
• Accepts the following power connectors:
• DC Plug: ID="1.35mm(min)," OD=3.5mm(max)
• DC Plug: ID="2.1mm(min)," OD=5.5mm(max)
• 3.5mm Stereo Plug