beijing kehai longhua industrial automation instrument co., ltd. has more than a dozen categories and more than 300 varieties, including steel thermometer series, steel thermometer series, oxygen and carbon calibration series, infrared thermometer series, thermal metal detector series, gas calorific value meter series, various large screen display series, general digital display control instrument series, as well as fast micro temperature measuring double head, oxygen and carbon calibration probe, sampler series, etc. qingdao hongruite food co., ltd. 1 fine sand recycling system 30 people
