10 Best Diagnostic & Test Thermometers 2025

When it comes to accurately measuring temperature, you need a thermometer that you can trust. That's why we reviewed and scored many products in the thermometer category, ranging from a 7.4 to a high-scoring 9.3. Trust us when we say that the Etekcity Lasergrip 800 Temperature Gun is the holy grail of diagnostic and test thermometers. With a 16:1 DTS ratio, this high-powered IR tool can measure temperatures from -58℉ to 1382℉, making it perfect for everything from cooking to engine maintenance. Don't let the bright yellow color fool you - this tool is no joke. If you want the best, go with Etekcity.