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.

Here is the proper way to install the battery:

Warning: Cancer and Reproductive Harm. www.p65warnings.ca.gov