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I am using a controller on it. The trick with the one in the power box is it is a bit more intelligent than me just switching it on and turning it up to be sure it will stay clear all night.
The power box has a temperature and humidity sensor with it so it can calculate the dew point and ramp the heater up and down accordingly, with an aggression setting to modify that output. The corrector on the CST would be milky white before my refractor even thought about dew. If I could arrange the money I would be quite tempted for the SCT by the version with the inbuilt USB3 hub.
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