Is a low cost flexible and easy to use hand-held, instrument designed to measure the carbon dioxide concentration and temperature in surrounding air. The large illuminated display presents the 2 values simultaneously. Built-in data output (RS232) makes it simple to log data for longer time. Audible alarm is included. Max/Min Average as well as TWA and STEL measurements are also available. The carbon dioxide sensor’s gold-plated infra-red waveguide and diffusion membrane filter provides you great reliability, accuracy and long-term stability.