It is recommended to carry out a technical inspection before each use of the device. Check the following:
- The state of the objective and eyepiece lenses (there should be no cracks, grease spots, dust, deposits).
- The device appearance (there should be no cracks on the housing).
- The state of the rechargeable battery (should be charged) and the electric contacts (should be no signs of salts, oxidation or debris).
- The controls should be in working order.