REED ST-805 - MAX;HOLD Functionality; Operating Precautions; Environmental Handling; Usage & Maintenance Guidance

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8. MAX/HOLD Button MAX/HOLD
The MAX Hold position is used to measure the maximum level of
sounds. The maximum measured level is updated continuously.
Pressing the button a second time will release the maximum hold
function and allow another measurement.
The Data HOLD function freezes the reading on the display.
Data HOLD Button: Press and hold the button for 2 seconds to turn
the Data HOLD function on or off.
9. Microphone
1/2-inch electret condenser microphone
10. Battery Cover
Operating Precautions
1. Wind blowing across the microphone will bring additional extraneous
noise. If using the instrument in the presence of wind, it is recom-
mended to put the windscreen on the microphone so as not to pick
up undesirable signals.
2. To achieve more accurate measurements, use an extension cable to
separate the microphone from the main body so that the effect of
unexpected sound reection can be eliminated.
3. Calibrate the instrument before operation if the instrument has not
been in use for a long period of time or was last operated under
extreme conditions.
4. Do not store or operate the instrument in high temperature and high
humidity environments.
5. Keep microphone dry and avoid severe vibrations.
6. When not in use, please take the battery out and keep the instrument
in a low humidity environment.