Proton 77378, Manual

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Technical Inspection
It is recommended to carry out a technical inspection before each use of the device. Check
the following:
The device appearance (there should be no cracks on the body).
The state of the objective and eyepiece lenses of the thermal imaging module (there
should be no cracks, grease spots, dirt or other deposits).
The state of the rechargeable battery (it should be charged) and the electric contacts
(there should be no signs of salts or oxidation).
The controls should be in working order.
The thermal imaging module is properly and firmly fixed on the optical device.