I have two. One cheap China eBay product and one Harbor Freight. They are identical except the color and stickers. Both work great and agree on temp. I have a wood fired oven that I need to know it is hot enough for pizza and cooler for bread or meats. Aim the LASER at the bricks and get the temp. Handy for checking the effectiveness of insulation, exhaust manifold heat, hot water heater output temp and a thousand other things!