5
2. PRECAUTIONS
• Do not press the speaker / luminance sensor / microphone hole using
something with a pointed tip. Doing so will damage an internal waterproof
sheet, resulting in a degraded waterproof property.
The Lithium Battery
• The lithium battery is used to maintain the OS Calendar & Clock function. It can back up data for
approximately 5 years of normal use and storage (Temperature = 20°, humidity = about 50%), but
its lifetime may be shorter depending on circumstances.
Vertical and horizontal clamps
• Always fully release the vertical/horizontal clamps when rotating the instrument or telescope.
Rotating with clamp(s) partially applied may adversely affect accuracy.
Backing up data
• Data should be backed up (transferred to an external device etc.) on a regular basis to prevent data
loss.
Use under low temperatures (Low Temperature Model only)
• Do not use force to scrape off frost from the lens or display unit screen. Frost is an abrasive material
and may scratch the instrument.
• If ice or snow attaches itself to the unit, wipe it off with a soft cloth, or place the unit in a warm room
until the ice melts, and then wipe off the meltwater. Operating the unit with ice or snow attached may
cause operation errors to occur.
• Wipe off condensation with a soft cloth before using the instrument. Not doing so may cause
operation errors to occur.
• The working duration of battery BDC70 will rapidly decline in cold temperatures. When using the
instrument in temperatures around -30°C, we recommend that you use an external battery (optional
accessory). However, if you unavoidably must use battery BDC70 for measurements in
temperatures around -30°C, recharge the battery in a warm room and keep the battery in a warm
place such as your pocket until it is used. (Working duration of battery will change with
environmental conditions.)
• The lens cap and lens hood may become difficult to attach in low temperatures. Keep them in a
warm place such as a pocket until attached.
• If the unit is carried between locations that have extreme temperature differences, protect the unit
from rapid temperature change by placing it in the carrying case.
• Please use the tribrach supplied as standard. If a different tribrach is used, angle measurement
errors may occur.
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