Can you use your digital thermometer in your propane grill as well? I tried but the probe wire melted. Now it was a cheap $20 thermometer as well and the probe wire was covered in rubber.
I don't use thermometers for grilling steaks since it's 600*+ and for a short time. I use my finger or if it's a very thick steak I use an instant read dial thermometer at the end. I use digital probe/cable therms for BBQing and Smoking. Direct flame or coal can damage any probe cable. If you want to use a therm for grilling you may have to shield the probe/cable from the fire with foil/pan and keep it suspended in the air. The Maverick ET-732 dual probe/wireless therm has been noted a lot on this forum and is available @ A-MAZE-N Products, LLC @ $59.99 with free Shipping (supposedly the best customer service.) I play the devil's advocate and try other therms other than the ET-732. I check a lot of reviews and if they have 4+ stars then I go for price and warranty. I prefer dedicated therms non-wireless. One for the cooking chamber and one for the food. These are the two I have that read 212* @ boiling pretty much @ sea level.
http://www.amazon.com/dp/B000P895XA/ref=pe_175190_21431760_3p_M3T1_ST1_dp_1 one year warranty.
All together with discounts they were about $35 including shipping. I think it's all about taking delicate care of the probe/cable. Once the cable is straightened out of the package it stays that way forever and is hung up when not in use. No water to clean the food chamber probe. I just shine it up with the scrubber side of a sponge and use a damp cloth to clean the food probe not getting close to the probe/cable connection.
Oder one from Todd....he is a member and one of our Sponsors. http://www.smokingmeatforums.com/a-maze-n-products
Amazon is NOT a sponsor.