SPI's Electronic Depth Gage comes with six interchangeable rods with a 0-22" capacity, carbide contact point and 2 extra points for small applications. Provides rapid direct reading measurement of hole depths. Indicator Features: 0-1" travel electronic indicator with 3/8" stem. Resolution: .0005"/.01mm Direct inch/metric conversion Zero reset at any position On/off button Hold feature Relative/absolute measuring Special Features: Rod extensions of 1", 2", 3", 4", 5" and 6" are included. Rods can be connected together for a full 0-22" capacity. Includes 2 extra points for small hole applications; one 0.078" dia. x 1" long and one needle point x 1" long. Base is hardened steel, ground and micro lapped for accuracy. Standard 4-48 thread removable carbide ball contact point. Includes shop hardened case.