Hearthstone vs Progress, bee in bonnet

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There's a pic of the Woodstock Cat thermometer in this post. Looks like a surface reader, not probe. If so, a standard Condar stove top thermometer will work.
 
That's all I see mentioned in the manual.

The catalytic combustor will start to burn the gases and particles in the smoke when the temperature of the smoke reaches approximately 500ºF, or after about 10-15 minutes of establishing a strong fire. Each stove comes with a surface thermometer. Use the surface thermometer to monitor your stove temperatures. The temperature on top of the stove is approximately 1/2 the temperature inside the stove, so when the thermometer on the stove top reads 250ºF, it is 500ºF inside.
You will find that after the combustor is engaged, surface temperatures will often rise considerably - evidence that the combustor is producing lots of heat!