My thermostat uses the expansion/contraction of a drop mercury to conduct electricity and trigger when to turn off and on._thankyoucomeagain_ t1_iyac13j wrote
All of them do. Mercury switched are very common.
slade797 t1_iybbfs7 wrote
Most are digital nowadays, no mercury.
_thankyoucomeagain_ t1_iybcyuz wrote
Seen very few digital but the do exist. I just repair them. What do I know.
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