Gas detector in industrial refrigeration processes and biological degradation processes, including exhaled breath. Depending on the required sensitivity, different types of sensors are used (e.g., flame ionization detector, semiconductor, electrochemical, photonic membranes). Detectors usually operate near the lower exposure limit of 25ppm; however, ammonia detection for industrial safety requires continuous monitoring above the fatal exposure limit of 0.1%. There are several different sensors that can be installed to detect hazardous gases in a residence. Carbon monoxide is a very dangerous, but odorless, colorless gas, making it difficult for humans to detect. Carbon monoxide detectors can be purchased for around US$20–60. Many local
Chainsaws in popular culture antagonist Leatherface chasing down victims on a highway for points would see low sales and limited exposure due to many stores refusal to sell it, along with fellow horror film adaptation "Halloween". Though chainsaws would be used as weapons in the 1970s/1980s horror film inspired cult "Splatterhouse" game series, and used by enemies in some beat-em ups (such as the Robocop arcade game) the next major appearance would not be until the 1990s. In 1993, pioneering first person shooter "Doom" was the first game including a chainsaw as a weapon for the player; giving chainsaws in horror games the same