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No markings for neg/pos position of battery. I have had it for over a year.A bit slow to get the final temperature --can take 30 secs to read 220 degrees.Not suitable for candy/jelly making because steam gets inside.Construction is lightweight. Expect it to last 1-2 years with light to moderate use then throw it away. Battery contacts had corroded slightly.Ok to use for checking food temperature, meat etc in a non-steamy environment. After it started failing, I tried to remove the battery. Trying to remove the flimsy battery cover broke it.
Also, as a culinary student, I wanted to clip it in the sleeve pocket of my chef jacket. This is annoying and leads to the thermometer falling out of the pocket. Shortly after purchasing this, I washed it by hand, expecting it to be waterproof, as claimed. Because of the thermometer length, the clip doesn't "catch" on the pocket. I'm unimpressed. It isn't. Like another reviewer, I found that it fogged up the temperature window.
Accuracy in liquids or anything with a uniform temperature however is excellent. Even when you place the probe before turning the unit on, it takes 5-7 seconds to get a read. This greatly reduces accuracy when checking the internal temp of large cuts of meat and predisposes to over cooking.
This one registers the temperature quickly and the hold button is really handy so it doesn't need to take the temperature up from ambient for a 2nd check of meat temperature on the grill. I didn't submerge them, just rinsing was enough to destroy them. I can wash it [it can get wet without dying]. This is the 3rd instant read thermometer we've tried. It's the only one that's lasted more than a couple of uses.
Not going to waste any more money on this brand. The first one I got was DOA from the box and was replaced. The replacement lasted just 3 months.
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