Subtronics [india] pvt ltd, an iso 9001:2000 certified company, offers portable gas monitor, pt200 in, which is an upgrade to the pt2001 model. Additional features include faster and accurate readings, easy zero adjustment, lightweight, improved battery operation, robust design, and can be calibrated according to user requirement to read either in ppm or percentage for most toxic and combustible gases. Also, pt200ln can be used to detect selectively hydrogen or carbon monoxide. The integrated probe attachment gives user a choice of flexible or small probe. While entering confined spaces, especially where space is limited, the user has the choice of using the short sensor; on the other hand, if the user wants to detect or track leads in pipelines or other inaccessible areas beyond the reach of human hands the convenient flexible probe extension makes it an ease to access such difficult unreachable areas. It is also attached with a table stand to be used as a freestanding table model or there is also an option to mount the instrument on the wall. The plug-in card system makes it easy for site replacement making maintenance minimum. The whole instrument is supplied in a kit form, which is convenient for user handling and storage.