Features and Benefits:Check current in a circuit without removing the fuseFind parasitic drain quickly and easilySaves time in diagnosing problemsGives a reading on a live circuitIntelligent audible tones and digital display An all new way to measure amps!  No need to remove a fuse which reduces the amount of time to determine the current in the circuit. Finding parasitic drains can now be done without removing a fuse or resetting the offending circuit. No more pull a fuse, check the meter, pull a fuse, or check the meter. Instead check the complete fuse box quickly. Intelligent audible tones and digital displays are featured. Active circuit unit beeps 3 times and displays the amp value. The Inactive circuit beeps continuously and displays (000). Open or blown fuses will not beep and will display (- – -). CONVENIENT ? Touch the probes to the top of the Fuse. VERSATILE ? Tests all of the most common automotive fuses types and amp ranges. AUDIBLE ? Tones lets you know when you are touching a fuse ? no guesswork. Makes working on under-the-dash fuse boxes simpler. Note: Will not short a circuit while the fuse is removed. WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov