Sweet Maria's Home Coffee Roasting

How to make a Thermometer Clip


Also see some alternative mounting ideas in our article on Adding a Thermometer to an Air Popper, and our Hearthware Gourmet Tip Page

Our Thermometers are on the Roaster Accessory Page (By the way, digital thermometers on a stem do not work well for roasting -the head is not meant to be exposed to such heat, and the digital readout goes black on you).

You need a good 550 degree thermometer to roast with a stovetop popper like the Whirley Pop (Theater 2), and referencing temperature to determine your "degree of roast" in any roaster is a plus. The Cooper 550 degree Small Thermometer is made as a pocket type, with a 1 inch and a 5 inch stem (a perfect stem length for poppers and most roaster appliances). Cooper Instruments makes better thermometers than the types we used to stock (Comark and Pelouze), and the face on the Cooper is easier to read. It can be easily re-calabrated too using the nut on the shaft (instructions included). Dialface thermometers should not be submerged in water while cleaning, and the face should not be exposed to high heat. If you notice the divot on the shaft about 2 inches from the tip ... well, from that point down the thermometer is "sensing" temperature. Keep that in mind because ideally you want the shaft to contact the coffee directly, not just sit the air (although this is useful too, such as an air roaster of any type since in the final roast stages the air and coffee temperatures are very close).


Making a Simple Thermometer Clip

I would try to drill your hole so the thermometer fits really snug ...then you don't need a clip to fiddle with. But if the thermometer is moving around during the roast and you can't read it, try this clip:

What you need:

  1. A piece of flexible spring steel - the easiest place to get this is from steel pallet strapping. Check out the dumpster behind your local lumber store. They still use the steel strapping for lumber.
  2. Drill and bits: possibly 5/32, or 3/16. Actually, the one I use (and its perfect for this) is a #25, which I think is a machinists sizing scale.
  3. Wire snips or sheet metal snips
  4. Pliers

1. Here's what you need. I have a metal hole punch, but you can drill the holes in the steel. It should be really thin stuff.

2. Trim a 3 inch piece of the thin steel strap. While you're at it, make a few between 2-3.5 inches. What the heck?

3. Punch or drill 2 holes, about 1/2 to 3/4 inch from each end. The holes can be bigger than

4. Make a 90 degree bend 1 inch in.

5. Make a 45 degree bend 1-1/2 inch from the other end


6. Pinch the two ends together while sliding the clip up the shaft. If the holes line up too well, it wont do it's job. You actually want the holes to be a bit out of line so when you release tension, it grips the thermometer. The cardboard in the picture is simply meant to represent the popper/roaster...


My Old "Tee-Nut" Method

What you need:

  1. 8/32, 9/32 or 10/32 Tee Nut -local hardware store
  2. High Temp RTV Sealant -auto parts store
  3. Drill and bits: possibly 5/32, 7/32, 15/64, 1/4, details below.
  4. Wire snips or sheet metal snips

What to do:

  1. First of all, Tee Nuts have little barbs that need to be clipped off with the snips.
  2. Try to size the Tee Nut to the diameter of the thermometer shaft you will be using. If it is not a really tight fit, don't worry.
  3. Open the RTV sealant and, with and coat the inside (threads) of the Tee Nut . This will help the thermometer grip and fit snug. I use a small nail to coat the threads. The idea here is to be able to remove the thermometer, so don't block the hole with the sealant.
  4. Drill a hole in the popper hood with a diameter a tad larger than the outside diameter of the Tee Nut shaft.
  5. Put 3 dabs of RTV sealant under the collar of the Tee Nut and fix it in place on the hood. Let it all dry before forcing the thermometer into place for the first time.