Fluke 421D, Руководство пользователя

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Distance Meter
Appendix
25
Measuring conditions
Measuring range
The range is limited to 100 m.
At night or dusk and if the target is in shadow the
measuring range without target plate is increased.
Use a target plate to increase the measurement range
during daylight or if the target has poor reflection
properties.
Target surfaces
Measuring errors can occur when measuring toward
colorless liquids (for example, water) or dust free glass,
Styrofoam or similar semi-permeable surfaces.
Aiming at high gloss surfaces may deflect the laser beam
and lead to measurement errors.
Against non-reflective and dark surfaces the measuring
time may increase.
Care and Cleaning
Do not immerse the instrument in water. Wipe off dirt with
a damp, soft cloth. Do not use aggressive cleaning
agents or solutions. Handle the instrument as you would
a telescope or camera.