I've learned with any advice regarding accuracy for anything, I take Kite's over anyone's lol. Like everyone has said, it's a personal preference and what you're comfortable with. I do use a couple hydrofarms, but I also own a Johnsons and a Herpstat. The herpstat being my favorite and the one I'm most comfortable using, however the Johnsons is just as good for an on/off for less money. The hydrofarms are good for me while I save up money for better ones. A 3 degree difference for an on/off IMO is not a huge deal, since mine's set for 90 degrees inside the tub, 93 degrees or 87 degrees doesn't make a huge difference for me. However, I will be buying better thermostats to replace them in the future.
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