I'm happy with my Tempoint 12-7014 thermometer probe . Had the same prope on my pipe when I use to have my gasification boiler. Worked great. Large easy to read face. I can see the needle from across the room. Nice thing is, you can calibrate the gauge in boiling water. Best price I found was $68.95. Some places want over 90. Has a nice clip that that hangs in the 1/4 inch whole you drill thru your pipe. Then your probe slides into that hanger. Nice interference fit. Tip of the probe should be centered in your pipe.