Check current in a circuit without removing the fuse. Find parasitic drain quickly and easily. Saves time in diagnosing problems. Gives a reading on a live circuit. Intelligent Fits 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 Fits 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. Fits 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.