This is a used Digital Depth Gauge that we have tested and everything is working as it should. 

Measure depths in tight spots and up to 22" deep with this super versatile tool. Precision measuring instrument used to determine the depth of any shape that has a step, groove, or slot. Indicator gauge conforms to AGD standard and federal accuracy specifications; can also be mounted on center or side of base. The digital face has an extra large LCD display for easy reading in inches, metric, or fractional.

Item# 400-D69

Range: 0 to 22" (with included 6 extension rods 1", 2", 3", 4", 5", 6")

Resolution: 0.0005"

Super high precision dial indicator - twice the accuracy of regular indicators

Base length: 4"

Includes 10 attachments (6 extension rods and 4 feeler points)

Resolution: .0005"/.01mm/1/128"

Accuracy (indicator): +/- 0.001"

Protective case and battery included

Here is the proper way to install the battery:

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