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I have 2 of the Sunbeams. The only problem I've had, on the oldest one, sometimes the temperature will switch from Fahrenheit to Celsius. It's more of a nuisanse than anything because it will still alarm when it hits the target temperature.
i have seen those thermometers before, at my local wal-marts. i have a $20 thermometer i got at a local grocery store. brand is "bbq master". works good, no problems with it.