Product use: mass concrete construction, to control pouring concrete block cement hydration heat temperature rise caused by the temperature difference between inside and outside and the cooling rate to prevent the concrete harmful temperature cracks of concrete construction technology key issues. The instrument's test results and timely feedback to the large volume of on-site pouring concrete block temperature changes, as well as the effect of of construction technical measures used, to provide a scientific basis for the construction and technical personnel to take timely thermostat measures. Technical parameters: 1, temperature range: -50 ° C to -120 ° C, the device working environment temperature: -20 ° C -60 ° C 3. Measurement Points: 24 channels (expandable), the sensor is connected Maximum length: 50 meters Power supply: 220V/AC terminal, the radio host of the standby power DC5V 6, means of communication: local USB communication primitives end wireless LAN communication 7 collection interval :1-99 minutes, test accuracy: 0.5 ° C, the wireless transmission distance: 1 mile line-of-sight-8km.