Measuring device

A measuring device, comprising:

• a bracket comprising a base and a first side plate on the base;
• and the first side plate defining an installation hole and a locking hole;
• a sliding ruler slidably attached to the bracket and comprising a top wall, a rear wall, and a first sidewall, the rear wall and the first sidewall being substantially perpendicularly extending from the top wall;
• and the rear wall defining a sliding slot;
• a limiting member engaged with the installation hole through the sliding slot;
• and
• a mounting member engaged in the locking hole through installation hole to secure the sliding ruler to the bracket when the sliding ruler is positioned in a desired position;
• wherein the first side plate comprises a first top surface and a first set of scale lines, and first scale values marking the first set of scale lines;
• and the first scale values increase incrementally from the base to a scale value N at the first top surface;
• and a distance between the first top surface and a bottom surface of the base is equal to the scale value N;
• the first sidewall comprises second set of scale lines, and second scale values marking the second set of scale lines;
• and the second scale values decrease incrementally from the base to the scale value N at the top wall.