Maintenance should be carried out no less frequently than twice a year, and should consist of the following measures:
Wipe external plastic and metal surfaces with a cotton cloth to remove dust and dirt.
Clean the electric contacts of the Battery Pack and the device's battery slot using a non-greasy organic solvent.
Check the objective and eyepiece lenses and if required, remove dust and dirt (preferably using a non-contact method). Cleaning of the exterior surfaces of the optics should only be done with products specifically designed for this purpose.
Store the device in a carrying case. Remove the Battery Pack for long-term storage.