Usage: control the pouring concrete block due to the temperature rise caused by the heat of hydration of cement, the temperature difference between inside and outside and the cooling rate to prevent harmful concrete temperature cracks in concrete construction technology in the construction of mass concrete. The instrument timely test results the feedback actual temperature changes in the field of mass concrete pouring block, as well as the effect of the construction technology adopted measures to provide a scientific basis for the construction and technical personnel to take timely thermostat countermeasures. Features: 1. Continue after power outage at the construction site work for more than six hours, the data is not lost 2 host end LCD function and USB interface, can read the temperature at the scene. Temperature alarm function, host and PC can view the remote wireless LAN communication, excellent anti-jamming transmitter, long distance transmission using digital sensors, temperature measurement accuracy and lower cost data of the test results can be curves or tables said that the data can be corrected. Technical parameters: 1, temperature range: -50 ℃ -120 ° C for 2 equipment work environment temperature: -20 ℃ -60 ℃, the temperature measurement points: 24 (scalable) 4, the sensor is connected to a maximum length: 50 meters power supply: terminal 220V/AC, standby power wireless host DC5V 6, means of communication: local USB communication primitives end wireless LAN communication 7, collection interval :1-99 minutes, test accuracy: 0.5 ° C, wireless transmission distance: line-of-sight 2km-8km.