Mastercool Infrared Thermometer with Circular Laser, 12:1 Ratio, 52224-A-SP, Gray

This device works very well, I've not had any problems with it at all. It's accurate, easy-to-use, and fun (A lot of my friends grab it and start taking the temperature of everything they can). I can't justify knocking off any stars for this, because it's not the devices fault, but this really hasn't been very useful for weatherizing. I was expecting to be able to really tell where my house leaked based on the output of this gun, but it's not too effective for that. The problem is, you have to point it at something specific, like the wall next to the window, or the floor in front of the door, and the air coming in just doesn't affect the temperature of those immediate surfaces enough to tell. I'm hoping it'll be more useful for attic insulation, but I'm not too hopeful. It has been somewhat useful for cooking, and I expect it'll become more so as I learn better how to cook and learn more about the science of food.

Purchased to monitor engine/radiator temperature to diagnose (false) overheating. Works well - extremely simple. It gives a continuously updated reading while the trigger is depressed, and also shows the highest recorded temperature during the measurement (you can hold it down for as short or long as you like). The display automatically shuts off just a couple seconds after you release the trigger, so you have to make sure to write down or remember the maximum reading because it will reset with the next trigger pull. Carrying case was nice - If left out in the sun it can overheat and will give an error message and be unable to read until it cools off (oops...). A little difficult to monitor engine parts because the beam spreads out 1 inch for every 12 inches away from the surface. This means you have to get as close as possible to what your measuring if you want it to be very accurate. (I targeted a radiator hose and didn't realize the engine exhaust pipe was in line a few feet behind it - got a REALLY high reading over 400 degrees.) Also, discovered that it works well to figure out what walls in your house are letting in the most heat/cold.

This is one fun toy. Originally I purchased it in order to see what each refrigerator and freezer shelf was reading so I would know which were the coldest. I use it also for getting the correct temperature in deep frying and it seems to be very accurate as compared to another thermometer I have that straddles the pot. It is never more than about 2-3 degrees off and since it is not a cake that is good enough for me. An excellent value for an excellent, lightweight, easy to use thermometer. There is no on/off switch but it does go off automatically after about 15 seconds, as the manual describes. Total battery life, also according to the manual is 15 minutes. I have been using this thing over and over for a month and it is still on the original 2 AAA batteries, which are included. The back light makes the display very clear and legible without reading glasses nor squinting. I find that it is best to point it from a distance of at least 5-6" and the reading is more stable. Very pleased with this purchase. Edited February 14, 2011. A commenter noticed my error in saying the battery life is 15 min. It should have read 15 hours - sorry about that. The batteries are still going strong almost a year later, after much use.

After reading the reviews on this infrared thermometer and comparing it to the others offered here on this site, I bought the Mastercool. I am very pleased with it. Not only did Amazon beat its estimated arrival date by three days, the package arrived in great condition. The carrying case is heavy duty and it also includes a very usable thermometer.(A bonus I didn't know was coming). The device itself is very easy to use, and with the push of an external button, you can toggle between Fahrenheit and Centigrade readings. The Mastercool is light, fits the hand well, and is very easy to aim at anything you want to know how warm or cold the object is. It is consistent in its readings, obtaining the same temperature within tenths of a degree from one reading to another (eg..several readings of my refrigerators and freezers taken several different times). It is very useful in the kitchen for determining temps of foods as they cook and how hot my stove burners and oven is running, things I've always wanted to know but didn't have a good way of measuring them. I cannot wait to test it on my Big Green Egg! I am using this thermometer to find air leaks all around my home as the temperature falls in order to repair them. I also believe it will be very useful on my RC model airplane engines to determine if they are running too hot or too cold (lean or rich). I want to try it on automobile tires as a quick way of determining a low pressure tire. I believe this thermometer was the best in its class and for the price, and it was definitely a great bargain. Since I am not conducting scientific experiments with it where absolute critical accuracy is needed, I believe this tool, for the vast majority of us, will fill the bill quite nicely for the uses we can put it to around the home or business.

Excellent, daily use in Toyota dealership, no problems

At this time it is handy for us to check our temperature. Thanks.

Excelente producto, me permite medir la temperatura del convertidor catalítico en autos y motos

Nice products

Excelente producto y todo bien por el momento