1. Placement: First, determine the position between the two observation points, and take the number of steps back and forth as the approximate midpoint position, then open the tripod with a moderate height (chest height) to make the stretching lengths of the three feet as equal as possible. Leveling in the later stage can save time, tighten the brake screw, and check whether the tripod is firm and prevent falling; Then open the instrument box, handle it gently, connect the leveling instrument to the tripod with the connecting screw, and tighten it to prevent it from loosening and falling.

2. Leveling: rough and flat, adjust the foot screw to center the bubble of circular leveling. When the bubble is in the center, the instrument is in a horizontal state; Turn the three-foot spiral with the index finger and thumb, and where the air bubble is indicates where it is high. At this time, just turn the spiral, and the operation method conforms to this rule: (the index finger of the right hand represents the forward direction, and the thumb of the left hand represents the forward direction).

3. aiming point: aim the target accurately with a telescope and locate the measured position. With one eye open and one eye closed, aim roughly with the collimator first, and fix the direction. When the target disappears in the field of vision, that is, the eye-collimator-target forms a line, at this time, the measured object is invisible, which means that the target object enters the field of vision of the telescope; Then observe the eyepiece, fine aim with micro-motion screw, and accurately locate the position of the object.

4. reading: use the middle wire of the crosshair to read on the leveling rod, from decimal to large, and read four digits. (that is, tilt your head upside down), meters and decimeters look at the notes on the ruler surface, centimeters look at the number of squares on the ruler surface, and millimeters look at it. 5. Calculation: Target height = reading of rear ruler+reading of rear sight height-reading of front ruler. The length of two feet is the same, and the measured difference is the elevation difference, so the next elevation can be measured by the known elevation.