Using the Enduro MT - 002 Digital Caliper Tool is easy. First, make sure the battery is properly installed. Then, open the jaws of the caliper and place the object you want to measure between them. Gently close the jaws until they touch the object, and read the measurement on the digital display. To switch between different measurement units, simply press the unit button. When using the caliper, avoid dropping it or subjecting it to strong impacts, as this could damage the internal components. After each use, clean the caliper with a soft cloth to keep it in good condition. Store it in a dry place to prevent rusting. Periodically check the battery level and replace it when it gets low to ensure accurate measurements.