Does anyone have a recommendation for a reasonably priced thermometer and/or thermo-hygrometer? I have so many temp sensors in the house that all report something slightly different it would be good to put a reliable thermometer at the location for a while and then adjust the reported temp on these devices to read something consistent. Thanks.
I've had one of these for years and been very happy with it. I set the 3 remotes I have next to the base unit and they compare very favorably and, from what I can tell, very accurately.
https://www.amazon.com/ThermoPro-TP-60S-Hygrometer-Thermometer-Temperature/dp/B06XKH666P/ref=sr_1_23?dchild=1&keywords=ThermoPro&qid=1612717159&sr=8-23
A man who has one thermometer knows what temperature it is, a man with two thermometers does not know what the temperature is.
Seriously, I use an immersible thermometer to make a "standard". Boiling water for 100 °C and a mixture of crushed ice and water for 0°C. Then I use that to compare to my other thermostats.
If testing in an open room watch for air currents. One thermometer could respond faster that another. If possible, I test my sensors in a closed cardboard box.
Humidity:
Saturated salt supply in a closed container is 75.0% RH at room temp.
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Good info but it doesn't matter what temperature the room is, it's always room temperature. Hat tip to Steven Wright.
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I am using the Honeywell T-6 Pro Z-wave and the built-in driver with zero issues. However I am not leveraging temp sensors around the house. Would suggest you look at a basic thermostat and then use the new built-in thermostat app to leverage the temp sensors and create a smart thermostat.
I have gotten a lot of witty responses to this one. All I really want to do is calibrate all of the sensors to something that is close to actual temp. This was recommended on another forum, I might give it a try:
Assuming sea level...
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You are right 
For those who are doing this test, the boiling point of water drops ~1 °F every 500 ft in altitude.
I have been using a cheap ($7) thermometer/hygrometer that I bought from Deal Xtreme a decade ago. It tracks my thermostat pretty well, so it became my local standard.
Most device handlers allow for a single offset and no correction for linearity (slope). For a wide range of temperature, it might make sense to create a rule that set both offset and slope correction.
Is it important that you have high accuracy? Or is having all sensors pretty consistent over a narrow range adequate?
For me, consistency between about 65 and 80F is adequate. If all of the sensors are 1F off, it really wouldn't matter to me. I am using them for basic comfort and convenience, not precision science. That might not be good enough for others.
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I feel your pain! In the end I put all my sensors in one place, averaged them all, then made them all read the same. May not be particularly accurate, but at least they’re now consistent!
And distilled water. And, if you really want to get technical about it, there is an ASTM for ice baths as well. But the preferred method is the triple point of water which is just slightly off of the ice point. No one in a lab uses boiling water for anything other than hot chocolate or soup. The bubbles actually create a minor difference in temp. (It can be as much as the .5 deg C change per 500 ft change in altitude above sea level) But, there are several fixed points for metals that are considered traceable.
Depending on the accuracy you are looking for, most labs actually use a stirred silicon oil or a dry well with a reference thermometer - Usually an SPRT.
That would be used if we were calibrating the calibration sensor
I have 3 of these and all 3 report the same thing when placed next to each other, they are reliable and use them to calibrate all new sensors that I buy.
https://www.amazon.ca/ThermoPro-Hygrometer-Thermometer-Humidity-Greenhouse/dp/B07WMF95DD/ref=sr_1_2
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Thanks @nclark - will check it out
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