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Comments from Unihedron
Anthony said I could share his email:-
"The SQM has a method for not showing a display if the battery is too low, but there is a possibility that a fluctuating battery voltage, or dying
battery will present different voltages during the measurement cycle.
Generally this has not been a problem. Another way to check the battery
voltage is to get the unit temperature by pressing once, then again and
holding the pushbutton. If the temperature shown is bad, then the battery is probably on the verge of its life.
Also, we have found that not all batteries have the same terminal dimensions, and this could cause a loose or poor connection. This can be
corrected by lightly squeezing the flower shaped connector on the SQM
battery lead with pliers then re-attaching the battery.
Also, Alkaline batteries do not do well in very cold conditions.
The unit does not have a fixed high value because of the nature of the
sensor. In some cases a dark room might yield 24, or just time out.
Oddly, there are places where cloud cover results in darker skies because of the great distance from light pollution. Such places are the desert, the ocean, and the hilltop at Cherry Springs PA. In these cases, not even the light from the sky reaches the meter, and an apparently abnormal reading is obtained.
I hope that helps to answer your questions.
Best regards,
Anthony Tekatch
Unihedron"
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