At present, various forms of infrared detectors in the security market are dazzling, overwhelming, uneven and inexpensive. How to choose a product with good cost performance? How to test it under family conditions? 1. Detection Range Testing - Instal..

Fresnel lens is the "glasses" of infrared probe. It is just like human glasses. Whether it is properly used or not directly affects the efficacy of the use. The improper use of Fresnel lens will cause erroneous and leaky actions, which will cause users ..