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MAX/MIN. Selects value shown on upper readout. Options
are: 1) highest or lowest (Max or Min) level detected since
meter was powered on; 2) 8-hour TWA (time-weighted
average; 3) 15-minute STEL (short-term exposure limit);
4) 1-hour average. Pressed briefly in high alarm
adjustment mode, shifts one digit to right.
SET. Pressed and held, enters/exits high alarm adjustment
mode.
UNIT. Selects °F or °C unit for ambient temperature
reading.
BKLT. Pressed briefly, turns backlight on and off. Also used
to decrement individual digits of high concentration alarm.
4. Battery compartment (on back)
5. Threaded tripod mounting screw hole (on bottom)
6. Jack for AC adaptor (on side)
Fig. 2. All possible display
indications
SETUP INSTRUCTIONS
INSTALL BATTERIES
THE HHAQ-108's battery compartment (Fig. 1, Callout 4) is
located on the lower back of the meter.
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