The Filler Detective - Automotive Body Filler Damage Detector, Tester (Black -  "LOWRIDER") Find hidden body damage and body filler on a car, truck or motorcycle Measures body filler thickness from 1/16" (62.5 mils) - 1/4" (250 mils) with measurement step of 1/16" Reveal the location and Depth of Body filler, Works with All popular body fillers Visual and Sound Alerts Easy to Use, One Button Operation