GB/T 12085.6-2022 specifies environmental test methods for dust and sand testing of optical and photonic instruments, as well as components from other fields (such as mechanical, chemical, and electronic equipment parts) included in these instruments. This standard aims to evaluate the resistance of products to fine particulate dust environments but explicitly does not apply to tests for abrasion resistance against coarse particulate sand and dust. The core testing instrument for conducting this test is the dust and sand test chamber (or cabinet), which is capable of simulating and controlling the dust concentration, wind speed, temperature, humidity, and other conditions required by the standard. The chamber typically includes test structures such as grid plates, as well as dust feeding devices, meters, and dehumidification devices to ensure the accuracy and repeatability of the test.