TI270 high-resolution, Wi-Fi enabled, USB-rechargeable, thermal imager from Klein Tools has a large LCD that displays unseen hot and cold spots for instant troubleshooting. It provides greater than 10,000-pixels resolution and three color palettes. TI270 also features high- and low-temperature points, crosshairs to pinpoint specific temperatures, and options for temperature alarms. A free app is available at Google Play and the App Store.