M300 is a contact type online microwave moisture tester from Coliy Technology GmbH. It uses the latest technology of microwave measurement and electronic circuit. It is easy to operate and reliable. It uses microwave absorption principle, the measurement data can be obtained in 100 milliseconds, the accuracy is up to 0.5%. The measurement range is 0-30% or higher, and provides full automatic range, without user intervention. It can almost detect any moisture in solid materials (cannot contain too much metal components): coal, cement, minerals, paper, sugar, grains, popcorn, flour, seeds, tobacco, tobacco, quartz sand and so on.