Autek Powerscan Yd208 Power Probe Electrical System Diagnostic scan Tool with 20 Feet Jumper Lead Set Extremely easy to use and highly reliable Built-in Flashlight enables you to work in the dark Easy to read AVOmeter allows you to read voltage, current and resistance at the fingertip Performs every type of service including power injection, measurement, ground testing, polarity checks, continuity testing and components activation With a flip of the power switch, you have an instant hot/ground lead for powering up electrical components like cooling fans, relays, etc.