That’s a great question. You’ll generally see a couple of different resolution equations mentioned for thermal devices. One measures the sensitivity of the sensor, or the interface that receives the thermal image. The bigger the numbers, the more detail the sensor is receiving. That’s generally a function of quality components and size of the objective lens. For higher-quality units, look for sensor resolution of about 640x480 pixels. You also want to pay attention to the display sensitivity. That’s a measurement of how much detail you’ll see on the screen of the device. The higher the number, the more contrast and detail you’ll observe. Resolution of 1064x748 provides very good visibility.