Measuring device

A measuring device, comprising:

• a bracket comprising a first set of scale lines comprising a plurality of first scale values;
• a sliding ruler slidably attached to the bracket and comprising a second set of scale lines comprising a plurality of second scale values;
• a securing assembly comprising a securing member and a resilient member mounted to the securing member;
• and
• a driving assembly rotatably attached to the bracket and comprising a gear;
• wherein the plurality of first scale values increase gradually from bottom to top, and the plurality of second scale values increase gradually from top to bottom;
• the gear is rotatable to slide the sliding ruler relative to the bracket;
• the securing member is secured to the bracket, and the resilient member is secured between the sliding ruler and the bracket;
• the securing member is rotatable to elastically deform the resilient member to press the sliding ruler between the securing assembly and the bracket when the sliding ruler is located in a desired position.