The Power Probe Adapter Tip Kit includes all the tips you need to expand the capabilities of your Power Probe. The Amp adapter tip allows your Power Probe to read Amps. The backlit display shows minimum, maximum, and current readings. The Pulse Modulation Width Adapter allows your Power Probe to test the duty cycle of a component. You can apply Pulse Modulation width from 5% to 100%. This is great for testing circuit fans.