how to Recalibrate The Old Eheim heater

[Kareen15]

I have a old Eheim heater w/ the button on top how do you Recalibrate them. Thanks Karen

[Ryan925]

Not sure about that particular heater but it's always money well spent to have any heater connected to something like an inkbird. Then the inkbird will monitor temp even if heater adjustment is off

[jim LI]

Not sure about that particular heater but it's always money well spent to have any heater connected to something like an inkbird. Then the inkbird will monitor temp even if heater adjustment is off

+1 on that !