Maintenance should be carried out no less frequently than twice a year, and should consist of the following measures:
Wipe the exterior surfaces of metal and plastic parts off dust and dirt with a cotton cloth. To avoid damage to the paint coating, do not use chemically active substances, solvents, etc.
Clean the electric terminals of the Battery Pack and device's battery slot using a grease-free organic solvent.
Check the objective and eyepieces lenses; rangefinder’s emitter and receiver lenses. If required, remove dust and sand (preferably by a noncontact method). Clean the external surfaces of the lenses with products expressly designed for this purpose.
Always store the device in its carrying case in a dry, well-ventilated space. Remove the Battery Pack for long-term storage.