Amazon.ae: Customer reviews: DOZYANT Stainless Steel Lid Thermometer Gas Grill Temperature Gauge Heat Indicator 22551 Replacement for Grill Master 720-0697 4 Burner, Aussie, Brinkman and Others, Adjustable for Accuration
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My only complaint about the Weber Jumbo Joe is that Weber did not think that someone using a portable grill needed to know how hot it is. I installed this tonight using a step bit to drill the hole. I have not used it yet so I can't vouch for its accuracy but it fits perfectly and looks great.
UPDATE AFTER 2 USES: 1. It needed to be adjusted by about 10-15 degrees which I confirmed with a digital thermometer that I use with my smoker. Not that big of an issue and is the reason I got one that was adjustable to begin with. 2. It fogged up a bit on the inside. I do not think that I have ever had an on-grill thermometer that did not do this and it does not affect its use so I am not too concerned.
The original temperature gauge was bad from new but I couldn't be bothered to take the grill back to the store. This replacement was a quick fix at a reasonable price. I don't know if it's accurate but it tells me when the grill has reached a stable temperature and I have figured out what works when grilling most food items.
My grill thermometer gauge is a perfect replacement for the one that came with my GrillMaster, oval with slightly larger numbers. I had to calibrate mine since water doesn't boil under 200°. I preheated my Pyrex cup and tipped it to one side on trivets, so the gauge could rest on the side without falling in (see photo). The calibration turn screw is extremely sensitive, just a little nudge to the right (clockwise) brings the temp down, left turns it up. I went through several iterations before I got it on point between 200° and the 220° line. Since the back of the gauge is not sealed, it fogs up pretty easily (see photo) making it difficult to read. The shape of my GrillMaster hood makes it tough to install, not the fault of the gauge.