1. Keep your feet firmly in place. Hold the ruler handle with one hand, turn the handle with the other, put the ruler band into the measuring object, let the ruler band fall with the gravity of the oil pendant, slowly turn the handle to reduce shaking, and then lift the ruler until you feel the oil pendant touches the bottom of the measuring body.
2. Keep the readings accurate. The line of sight should be perpendicular to the tape, read millimeter first, read centimeter, decimeter, meter again
3. Clean the tape. While rotating the handle, wipe the tape with a dry cloth, and put it in a dry and clean packaging box after recycling.