My personal opinion is that the temperature logger is a must-build for everyone, so you can know for sure when your scope is at equilibrium and also measure accurately how well fans or other cooling thingys are doing. For the cost, about $100 in parts and some soldering, it's good value.
I took the scope up to rockhampton in April, and even with its lovely climate the temp logger was very useful to me.
regards, Bird
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