This is the ORIGINAL D-250 nail hole detector from Taray International.
The D-250 is engineered to detect nail holes, broken steel belts, and zippers in steel belted radial passenger tires, light truck, and truck tires.
The D-250 detector uses a static electricity discharge to visually identify flaws in a tire during the inspection process.
Using the foot activated controls, move the detection wand back and forth inside the entire circumference of the tire. A low pitched sound as well as a purple-white stream of static electricity will be emitted from the wand tip.
When a flaw is detected, the sound will increase to a higher pitch and the purplewhite stream will converge and glow brightly on the exact location of the flaw.