What if the tester is not permanently mounted? That is, what if the tester
is brought out only occasionally, from my work-bench drawer?
I know batteries have a shelf life, even if they aren't being used. Are CO
alarms similarly limited?

"ChrisGW" wrote in message
...
Bill Browning wrote:
They say to replace your CO alarms every 5 or 10 years. Why? If they
still
test OK, why replace them?
Bill B.


The sensors are not as sensitive after time, due to many factors including
dirt
grease etc...

ChrisGW