Accuracy Check

Regularly check the accuracy of the distance measurement and grade measurement (GLM 50-23 G).

Accuracy Check of the Distance Measurement

For the accuracy check, the measurement should be taken under favourable conditions, i.e. the measuring section should be indoors and the target surface for the measurement should be smooth and reflect well (e.g. a white-painted wall).

  1. Select a measuring section of approx. 3 to 10 m long, the length of which you know exactly (e.g. room width, doorway).
  2. Measure the section 10 times in succession.
  1. The deviation of individual measurements from the exact known value may be maximum ±2 mm throughout the entire measuring section under favourable conditions. Log the measurements, so that you can compare their accuracy at a later point of time.

Accuracy Check and Calibration of the Grade Measurement (GLM 50-23 G)

  1. To do this, lay the measuring tool on a table and measure the inclination.
  2. Turn the measuring tool by 180° and measure the inclination again.
  1. The difference between the displayed values must not exceed 0.3°.

In case of greater deviation, the measuring tool must be recalibrated.

  1. Press the  button to open the Basic settings menu.
  2. Select  and confirm the selection with the  button.
  3. Follow the instructions on the display.
After strong temperature changes and after knocks, we recommend an accuracy check and, if necessary, calibration of the measuring tool. After a temperature variation, the measuring tool must adjust to the ambient temperature for a while before calibration is performed.