CALVAN Amp Hound Voltage Drain Tester CV74 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 Ÿ?? pull a fuse, check the meter, pull a fuse, check the meterŸ??Instead, check the complete fuse box quickly. Intelligent Audible tones & digital displays Active circuit unit beeps 3 times & displays amp value. Inactive circuit beeps continuously and displays (000) Open or blown fuse will not beep & displays (- - -) CONVENIENT Ÿ?? Touch the probes to the top of the Fuse. VERSITILE Ÿ?? Tests all of the most common automotive fuses types and amp ranges. AUDIBLE Ÿ?? Tones lets you know when you are touching a fuse Ÿ?? no guesswork. Makes working on under-the-dash fuse boxes simpler. Note: Will not short a circuit while the fuse is removed