I need advice about thermometer.

[dakski]

I test them with ice water and boiling water. Ice water should be right around 32 degrees F. and boiling should be around 212 degrees F.

Those sensor push things are cool but isn’t that more for ambient temps?

They aren't designed to read liquid temps. And you realize boiling water boils ABOVE 212 too right?

Sorry, but this isn't an accurate test.

Yes, the sensor push are for ambient temps.

I agree with Craig that's not the best test. Hit your wall thermostat at the same distance you would hit the tank floor and they should be within 1F of each other.