At many shows I have been asked what can you do for a thermometer that has a broken tube?
The two types of thermometers pictured here provide exact replacements for broken tubes.
The fish bone thermometer on the left is the easiest to work with. Place a flat blade under the black fish bone skeleton and you can pop it from the white background. The tube and gold paper backing is not even glued in place a will fall right into your hand. With the key thermometer on the right you will need a sharp blade like an exacto knife as you can get under the paper and remove the tube and backing with little effort. Remove the damaged tube and backing from the thermometer you wish to repair, use a little plastic cement to glue the replacement tube in and you are in business. These two types of thermometers can be found for less than $5 with a little looking. Flea markets are excellent places to look.
[This message has been edited by wfort39663 (edited 12-07-2007).]