Small, solid, visible alarm seems to work well on my plane. It is useful to be able to set the maximum value. Digital reading is important to me. I place the device so I can see the face and when there is a carbon monoxide alarm the LEDs in the four corners will flash. It needs to be calibrated every 6 months and if we don't buy a calibration kit it needs to be sent back for calibration. In any case, the costs increase. For our mission, searching for CO peaks in the cockpit of a small airplane, we don't need an exact calibration. The instructions suggest you can go 2 years and then another 180 days before you need to calibrate it. The cost of the device is not so high, so it is normal to spend money on feces every few years. It would be nice if the device had a backlight, but not critical.
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