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
WORX lightweight electric trimmer. Updated iterations of the WORX GT continue to be made and sold by Positec. WORX is also known for selling items like lawn mowers and chainsaws. It offers cordless electric lawn mowers that run exclusively on battery power and have zero carbon emissions. In 2014, WORX released a fully robotic lawn mower (dubbed the "WORX Landroid") that will mow the lawn, returning to a charging station if the battery begins to run low. The Worx JawSaw is a chainsaw with a partially enclosed blade that is designed for safety. Other products include leaf blowers, yard carts, and