eBay with Dgystech has the Digital Thermometer and Temperature Display (Fahrenheit) for $3.49 with free shipping. Features a low profile design, and operates on a single AG13 button battery. Celsius version is $1.98 shipped.
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Hey leo: It's "CelSius.
davec:
The °C version which I already have is not so easily hackable into a °F version. I have done that previously by solder-bridging PCB pads as you noted. This one, however, has a 7X2 array of pads along one end of the PCB labeled SW1 thru SW7, Unfortunately, they do not appear to be solderable. looking instead like those which are used for making pressure connections. If one knew the function of the 7 various switches or had the patience to bug it out, one could probably hack it using conductive epoxy instead of solder. Bugging it out would probably require using fly leads cuz those pads, as assembled, are between the PCB and the display.
For the rest of you, °F = 32 + (1.8 * °C)
What?
this is a better model that does BOTH C & F for less then $3 SHIPPED
http://www.ebay.com/itm/Digital-Fridge-Refrigerator-Freezer-Thermometer-Temperature-Sensor-Fahrenheit-/160768384947?pt=LH_DefaultDomain_0&hash=item256e8adfb3
and the same thing Ben is hocking is less then $2 SHIPPED
http://www.ebay.com/itm/Digital-LCD-Thermometer-for-Refrigerator-Freezer-H155-/220948459711?pt=LH_DefaultDomain_0&hash=item33718df0bf
Sam this one does appear to be (is listed as) Fahrenheit, and is pictured displaying F.
^
I realize. When I said "The °C version which I already have.." I was referring to the one in deal #248867 which I already have and you said you ordered. In your post #12 you suggested that that one may be hackable to display °F. When I saw this deal, it motivated me to open up the one I have and see, because hacking a $2 one would be a better deal than this. However, as I said above, it may be hackable, but it won't be as simple as solder-bridging two copper pads. Thus I reported my findings to you, fyi.
Incidentally, the other is panel-mountable by means of simply pushing it into a pre-cut rectangular holes. It has the little molded-in retainers on each end -- similar to many panel-mounted switches -- and a flange around the display to retain it in the panel. fwiw.
Btw, it also speaks well to its robustness that it survived my ham-handed dis/re-assembly and still works.
Is there any reason why this cannot be used as an indoor temperature meter? Any guesses on the accuracy of the reading?
^ It should be fine for that, just less optimal due to having the bulk and messiness of a cord that the sensor is tethered to.