Yes it is more accurate to place the probe inside the tub. That said there are more risks involved I would NOT recommend this method with a hydrofarm full stop they are far to inaccurate to be acceptable for this method. You also really need a fail safe (or a herpstat) for interior placement. If you wish to use this method and are willing to buy a new thermostat (herpstat 1 would be the best choice for this use) PM me and we can walk through the things that must be done to insure it is safe.
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