![background image](http://html1.mh-extra.com/html/omega/hhaq-108/hhaq-108_user-manual_4146491020.webp)
Er1
: Typically indicates damage to the formaldehyde sensor,
ambient temperature sensor or RH sensor.
Er2
: Typically displayed for 1 second on the lower readout
when the meter tries to measure a temperature or RH
value outside the specified measurement range. It may
also be produced by clearing the Max/Min memory.
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