This is a more expensive model that is designed to be used for multiple tanks at the same time. It comes with a single sensor, but up to three additional probes may be added. The digital display connects wireless to the probe(s), and can be toggled between Celsius and Fahrenheit as desired. Both the sensor and display run on AAA batteries that are not provided. I have not used this meter myself, and reviews are widely mixed. Those who report they like them, swear by them. Most of the complaints I've heard personally were due to issues with the wireless receiver, or cost of the batteries for both components, rather than accuracy.