The Power Probe Amp Tip takes your Power Probe from only measuring dc volts to amps. The backlit LCD screen displays both the Amps as well as the min/max amps. It measures as amps as low as 1mA and up to 10A continuesly. The adapter tip allows you to ensure that the current never exceeds 75% of the fuse that it protects. The adapter is easy to install. Just remove the tip from your power probe and install the adapter into the banana jack.