Yes that is the best way. I would recommend against the combination of Hydrofarm and accurite. The potential error of both is 4 degrees up or down. I would suggest this is far too much potential range.
I would suggest at least one be more accurate if you have an accurate thermostat and the accurite reads grossly different it becomes suspect and can be replaced. Or vise versa. The stupid part is a higher accuracy thermometer is about the same as a thermostat.
I would recommend a herpstat they have high accuracy. Personally I don't like batteries inside an enclosure so I would not suggest an accurite either. There are many others that are lower cost smaller size and higher accuracy.
They may have been better years ago I can't say the the newer ones are very poor. I have had three and two were more that the specs allow ( replaced) and the last was just inside the 4 degree range so I gave it away. Waste of money.
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