Bacharach TGA Trace Gas Analyzer is an advanced N2O Analyzer (N2O is a Nitrous oxide, commonly known as laughing gas). Bacharach TGA's rechargeable LI - ION battery provides 8 to 12 hours of continuous operation with a low battery indicator. Bacharach TGA uses a highly accurate non-dispersive IR cell providing superior stability and repeatability, with a measurement resolution of 1PPM-full range. Bacharach TGA provides measurements in either PPM, real time or elapsed time TWA and it has a leak check mode with audible and visual alarms. Bacharach TGA has an internal sampling pump and the self contained purge-air bag provides a constant zero enabling the Analyzer to be used in contaminated environments. The TGA has data-logging capabilities to store up to 200 readings which can be downloaded to an optional printer or to a computer. Mfg. part no. Bacharach 3015-4790.