Photoelectric sensors; Pressure sensors; Pressure indicators; Frequency converters; Electric control devices for heating and energy management; Electrical controlling devices; Data processing apparatus; Electric control panels; Technical measuring, testing and checking apparatus and instruments for measuring, testing and checking the temperature, pressure, quantity and concentration of gas and liquids; Gas testing instruments; Pressure measuring apparatus; Surveying machines and instruments; Temperature sensors; Apparatus and instruments for humidity monitoring and documentation, used to monitor and record the temperature, humidity, location and other data of objects, with network monitoring and early warning functions, namely, electronic cold chain temperature and humidity monitor; Voltage monitor modules; Air analysis apparatus; Thermostats for vehicles; Transmitting and receiving apparatus for long-distance transmission; Meat thermometers; Electrical monitoring control apparatus, used to monitor the operating status of industrial equipment, voltage, current, temperature of key devices, energy consumption and other parameters, namely, integrated voltage monitor modules and current protection monitor module, and intelligent electric, control panel; Data processing apparatus; Downloadable application software for cloud computing services, in the field of cold chain industry, used to provide 24-hour remote, dynamic monitoring and storage, manage the temperature, humidity, location and other information of the subject matter, and provide over-limit and fault reminders for remote equipment operating status monitoring; downloadable network management software and downloadable application software for monitoring and recording environmental temperature, humidity, location and other data in the pharmaceutical, food cold chain logistics, storage management and distribution link; Scales; Power distributing boxes