caliper battery saver

Tired of always finding the digital caliper empty, I created this super compact tool to safeguard the battery.we recommend using brim as the pieces are very small. How to install: 1 ► Open the upper door for gauges with possibility of programming cable.  2  ►  Insert the frist print of battery saver 3  ► Insert the second print for lock the battery saver  ENJOY THE THINK