Product quality degradation and production process interruptions can result in financial losses for companies. To minimize these risks, temperature and humidity monitoring for quality control and assurance is essential. In particular, food temperature control helps protect health by helping consumers consume safe food. In addition, the pharmaceutical and medical industries are directly related to human life, making it even more important. The Litmus 300 periodically measures temperature and humidity and transmits the data to the MyLitmus cloud via LTE Cat. M1. Designed for industrial use, it supports IP67 water and dust resistance and can be equipped with an external temperature probe to measure a wider range of temperatures. The single rail system is designed to connect multiple sensor devices measuring temperature, humidity, CO2, etc. as individual modules and supply power to all connected devices.