Do not repair or dismantle an attachment under guarantee by yourself!
The device can be used over a wide range of temperatures. If the device has been operated in the cold and brought into a warm room, do not remove it from its carrying case for at least 2-3 hours; this will prevent condensation forming on the external optical elements.
Inspect and maintain the device regularly to ensure trouble-free operation and to avert and eliminate the cases of premature wear and tear and failure of components.