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If it's a must that you be away from your egg for an extended period of time I would highly recommend a digital controller unit. There are many different brands and models to fit your wants and/or needs with equally varying price ranges. I personally love my Aubert Instruments unit for the no-frills simplicity and affordability. Sure you may be able to maintain a close constant temp wirlthout one,it's really not hard to do,but for overnighters or a Sunday full of errands they really set your mind at ease and give your confidence a big boost.