Pulsar Merger LRF XP50, Руководство пользователя

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Technical Maintenance
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 lenses of the eyepiece, objective and rangefinder. 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.