♦Wall type exquisite appearance design, installation screws on both sides, simple installation, saving space. ♦Made of high density PP material shell, safe, anticorrosion, durable. ♦The waterproof strip is enclosed inside and the moisture proof effect is remarkable.Adopts the professional test nh3 concentration sensor probe, which can effectively detect nh3 gas. ♦The design of air vent makes the gas flow more unobstructed, improved accuracy and response time.It has the characteristics of wide measurement range, high accuracy, good linearity, good universality, easy to use, easy to install and long transmission distance.