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thermostat and thermometer: different readings?

bapkate

bapkate

Katherine
Ok, so I just got my lovely new thermostat in the mail, strapped it to the bottom of my tank right over my UTH and warmed 'er up. I also have a thermometer with a probe placed right next to the thermostat.

The problem is, there's like a 2 degree difference between what my thermostat reads and what my thermometer reads.

More details: I have a Herpstat ND proportional thermostat and a Zilla thermometer/hygrometer. The thermostat's reading 85 f and the thermometer reads 83.

Is this bad? I feel like it's excessive to get a third gauge to see which one's reading accurately, and I'm more inclined to go with my fancy schamce thermostat. Should I not even worry about this? Is 2 degrees a big deal?
 
I'd go with the fancy schmancy thermostat. Plus, you're erring on the side of caution if you set the thermostat for 85F, and the thermometer reads 83F. If it's really 83F, no harm done. If the thermometer was reading 2F high, OTOH, 87F is getting a little too warm for my liking. See what the accuracy of each is, just for fun. I bet the thermostat has a smaller range, such as .2 degrees plus or minus, and the thermometer may be 1 degree. Just a guess.
 
Yes, the thermostat has the capacity to be more accurate, definitely (it reads to a first decimal). Plus the thermometer has two probes but only one reading. I'm thinking it maybe takes two readings and averages them. I put the probes right next to each other, but still, who knows.
 
The Zilla hygrometer/thermometer has a probe for each function. To find out which probe is which cup one in your palm and breathe on it. One of the readings will go up, unless there's something seriously wrong with you.
 
That...actually makes a lot of sense. I thought I read the instructions pretty carefully, but I guess I missed that. Woops!
 
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