These test rods are made of a virtually indestructible plastic material called delrin. Use to calibrate your metal detector. Rods are red (ferrous), green (non-ferrous), and blue (316 stainlesssteel) for easy identification. The high-grade certified metal spheres are completely sealed within the rod. 3/8" square x 6"L.
Calibrating your metal detector has never been easier. These metal detector test rods are just examples of the many styles of tools available. Please call 800/826-8302 for availability on test cylinders, whips, balls, sticks, or any special applications.