Backwoods Savage said:
Why me, of course. :lol:
Get one from a good company. I have mentioned this company several times. Everybody goes to the cheap Harbor Freight one instead, then doubts its accuracy.
Once again, for the same $49... the LT100:
http://www.instrumart.com/Product.aspx?ProductID=10228
This is a great company. I got the big brother to this little baby, but this one has the same sensor and guts, just less options. I trust it and I feel it is extremely accurate. Best thing about Instrumart is they offer lifetime phone support... even for a $49 item like this. Try that with Harbor Freight. They stand by their products as well. I dropped my LT300 a few times and it developed a rattle in it. Even after telling them it was my fault, they repaired the unit for free. Only thing I paid was $5 to ship it there. Try that with Harbor Freight. They have real live engineers on tech support, and you just call them and they'll explain exactly what the deal is with your findings. I really learned how to use the thing properly by calling and asking questions. Try that with HF.
I was told that they were very aggressive about getting these things made to the quality of a name meter like Fluke but at a cheaper price point, and they sell thousands of them to various industries each year with few complaints.
True, you can't shoot shiny metallic objects without spending a lot more for one with adjustable emissivity (mine has it; I never use it), but for 95% of what you'll ever need to scan with it, the default setting will get you to within +/- 1-3%. That includes all parts of your stove install. Glass, cast iron, steel, soapstone, flue pipe, surfaces surrounding your stove. The contact magnetic thermometers are all over the map, and the cheap probe thermos have been demonstrated to be even worse.
As far as flue temps, you should realize that the only truly accurate way is with a thermocouple probe and a digital thermometer. As the season goes on, the soot and fly ash inside the pipe will act as an insulator and give increasingly lower readings at the same internal temperature. My IR gun accepts K-type thermocouples, so I got one that reads up to 1300ºF for another $40. It is only 1/8" in diameter, so it just fits into one of the flue pipe screw holes. I'll periodically check the difference between the two numbers at a few different temps to allow me to know exactly what the internal flue gas temp really is at that time in the season.
The first shot of the sequence is of my pipe about 15 minutes after a stone cold start. You can see the IR reading is 636ºF, while the probe temp is 1281º. You can also see the old Vermont Casting contact thermometer ain't too far off... reading a little over 600º vs. the more accurate surface temp as read by the gun. If you doubt my flue gases were that high, check out the shot of the probe. Even though the camera flash robbed some of the color as it looked in the darkened basement, as you can see, it's glowing red as can be.
The second reading was taken at cruising temp. The IR says 271º, the probe says 603º.... a great flue gas temp for my stove. The stove cruises at about 650-750ºF with a flue temp this high.
BTW, the probe is even more accurate than the gun... about +/- 1ºF over its entire range.