"The RTR502BL is a temperature data logger with an external temperature sensor and quick response to changes in temperature. It has a large selection of other optional sensors with a wide measurement range (-60℃ to +155℃), which provide extra versatility to match your situation if needed. It also features a waterproof rating of IP64 (splash proof) and an extended battery life of up to 4 years.Data can be transmitted from a logger to a base unit and then automatically uploaded to the free cloud storage software or saved to a specified location. Data can also be checked on your PC screen or on-site with one of our compatible data collectors.The RTR-502B is comparatively quick to follow changes in temperature and can be used with a wide variety of sensors, making it suitable for use in logging product temperature of both liquids and solids. It is also well suited for measuring ambient temperatures inside refrigeration and freezer uni