How hot is it? Acurite wireless indoor-outdoor thermometer. (2025 Update) Featured

I just gathered every thermometer I could find and put then near the one I want to verify. The three that read within 1 degree of each other were my reference

I have others, but they are buried under papers etc. I have no idea wher they are.

There is no way to calibrate an electronic thermometer that you buy. They are not adjustable, except on factory, some models.

You can buy a bunch, put them in the centre of a closed box, and put the box in a table of a closed room, with no heating or cooling. They should all be a decimal from one another, after a while.

You have 2 calibration points. The boiling point and freezing point of pure water at sea level (corrected) VERY simple to CHECK calibration

If the sensor is separate from the electronic sending unit, dunk the sensor in a bowl of ice water. It should be exactly 32°F/0°C.

If the sensor is integral to the electronics, put the whole works in a plastic ziplock and then dunk it in the ice water bath.

By calibrate, I meant compare with an accurate thermometer, and if mine reads 3 degrees higher than it, then in the future, I subtract 3 degrees from what mine says.

It's so easy to find clocks. Is there no public or semi-public place where the temperature is available?

Go to most any hardware store and look on their shelves at their thermomaers and compair them.

Go to a friend's house and get next to their heating/cooling thermostat.

Head down to your local photorapher's shop and ask her to check your thermometer against their darkroom unit.

Oh, wait, I'm a half century late....

Do you have digital meat thermometer? How about your neighbor?

As for the outdoor, important to keep the sensor out of direct sun. My weather station will read a few degrees high from about noon to 4PM.

Excellent. I should have thought of this, but I've been sick, not sleeping much, at least that's my story.

I did think of this, but I don't trust their thermostat or mine to actually be the right temp. .If it's mine and I feel cold or hot, I turn it up or down and don't worrry about the number. (and I've suggested that to others here.) But I don't want to do that here, partly because I'm going to rave about this thing on Amazon's review and I want to be correct.

You had me going until I read this line!

I don't.

Some reviewers complained about the two temps not maching even when they were next to each other. Mine were 2 degrees apart but in 10 minutes one went down and the o ther went up 1.

Did you look up in the attic ? :-) John T.

Why does it matter? It's bound to be close.

Try WunderMap.

Right now, the ones in my area are showing somewhere around 37 or 38 F. I have a bimetallic analog thermometer hanging near my back door that shows an RCH under 40. Close enough for jazz.

I usually put on (or take off) a sweater. Isn't that what your mother told you to do?

If you ever see a Honeywell RTH9600WF in a dumpster, grab it.

Sure, but at Micky's age, his mother may be gone and now has no one to ask.

Bullshit.

"Calibration" is *defined* as simply "the comparison of an unknown to a known standard." Adjustment is not a necessary component of calibration.

I worked many years in a FDA-regulated calibration laboratory that was traceable to NIST (formerly NBS).

If you are so neurotic to want a home thermometer calibrated, try one of these:

The service will likely cost orders of magnitude more than the thermometer.

Happy New Year

That's often the easiest way to discover anomalous instruments. Given a handful of widgets, choose one that behaves like all its friends, rejecting the misfits.

What is your definition of accuracy? How much do you really care?

Turning it up or down was only done once, years ago, when I got the new thermostat. to find the best all-around settings. . It could be considered calibrating the home's thermostat.. Once I found the right spot, I haven't changed the day and night settings for 30 years. . I have a setback thermostat, which I bought when they first came out. maybe 1983 or 88. It's semi-mechanical, that is. it's like the classic round honeywell thermostats, not digital in any way except the clock read-out. There are slide switches with 30 or 35 positions each, to set the temp for day and for night. Not sold anymore. not for decades.

But I no longer leave for work every day, and my sleep is not on a schedule. I'm as likely to be up almost all night as in the day. But it worked out well. The battery in the thermostat died years ago and so it's always on the day setting. I waste very little money and very little of the world's resources, but this is an exception. For the furnace, my mother turned the thermostat down every night at bedtime and every morning when she woke up. She didn't rely on a battery.

With all the comments, thought and suggestion it reminded of something from many, many years ago and thought I would share.

I use to be a "Maintenance Supervisor at a Plastic Extrusion Company. One day I was walking down the Office hallway and Harry was in his office as I went by. He shouted out to me and asked if it felt hot in his office. He looked over at a Mercury Thermometer that he had on his wall. I looked at it and said, I am all lathered up Harry from running myself around. I will stop back later and check the A/C.

I waited until he went to lunch. Then I went into his office and removed the Thermometer and slid the glass tube down about 2 degrees and put it back on the wall. Later when he was back in his office I stopped in and told him I made an adjustment and does it feel more comfortable?? He looked at his Thermometer and said "perfect".

End of story!! :-)