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5. Status LED indicator (red/green). Refer to the Status LED Indicator Description
later in this section.
6. MAX‐MIN button. Refer to the Button
Descriptions later in this section.
7. Sensors (Thermistor internal air
temperature and capacitive RH sensor)
8. Power and Datalog Start/Stop button.
Refer to the Button Descriptions later in this section.
9. MARK/Battery life button. Refer to the Button Descriptions later in this
section.
10. USB plug
11. Battery compartment (CR2032 x 2) on
rear
12. Wall hanging mount (rear). Mounting
screw supplied.
Button Descriptions
POWER button. Short press to power ON or OFF. Note that the datalogger
cannot be switched OFF while datalogging is in progress.
START/STOP button (same physical button as the Power button above). Press
and hold for 5 seconds to start or stop the datalogger. Note that the datalogger will
not start unless it has been configured using the 'PDF Logger Configuration Tool.exe'
program as described later in this user manual.
Maximum‐Minimum Reading button. At any time, short press to step
through the highest (MX) and lowest (MIN) readings recorded in the current
datalogging session.
Bookmark button. Manually place a time‐stamped 'bookmark' in the datalog
report by pressing and holding the button until the displayed measurement flashes 3
times. Up to eight (8) bookmarks can be saved.
Battery Status Note: Short press the MARK button to display the approximate number
of days remaining for the battery life.
888.610.7664
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www.calcert.com
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RHT30_TH30‐en‐GB_V1.0 (11/16)
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