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If the wafer doesn't spring a leak, it can last for 20 years.
One thing is sure .... eventually, it WILL spring a leak and fail. There is no time limit on this.
They are cheap, and although they can last for years they should be changed every 2 years at least.
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What he said
Plus .... remember the way a standard thermostat works ..... there HAS to be a temp. swing, how else would the device know when to turn on and off. This will have little adverse effect on the eggs, if it did then 90% of the incubators out there wouldn't work.
On the...