The 4R-PID is a high-performance photoionization PID sensor. This sensor features high sensitivity, wide range, and broad spectrum, enabling the detection of thousands of volatile organic compounds (VOCs) and some inorganic vapors in various applications. It offers a detection range of up to 10,000 ppm and a detection limit as low as 1 ppb, exhibiting extremely fast response and very high resolution. It can be used in various handheld portable and field-mounted instruments, as well as in a variety of analytical instruments.