Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! This radon detector is an efficient, portable device capable of monitoring radon concentrations in real time. Therefore, it is critical to use this instrument for radon monitoring in environments such as homes, building construction, schools, and public spaces. The device is easy to operate, just turn it on, place it in the detection area, and obtain radon concentration data in real time. Radon can enter buildings through crevices in floors, walls, and pipes, and detecting and controlling radon levels is important to a safe living environment. With their ease of use and efficiency, our radon detectors are ideal for keeping your home and work environment safe. Color: As Shown Material: ABS Package Contents: 1 * Radon gas detector 1 * English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.