The CAL 2000 LT is the gas calibrator of choice for the user who does not need variable flow rates or concentrations. The CAL 2000 LT is available in pre-set flow-rates of 0.5 or 1.0 PPM. Generating cells are rated at ten or twenty-five hours and are available for chlorine, hydrogen, hydrogen cyanide and hydrogen sulfide. A gas concentration must be specified when ordering generating cells, over a range of 1 to 25 ppm in whole ppm increments. To change gas type or concentration, simply insert a different cell into the instrument.The CAL 2000 LT is microprocessor controlled and has an LCD display allowing easy user access to information such as cell life remaining, battery status, gas concentration and flow-rate. The generating cells are interchangeable and field replaceable and come with a one year warranty. The CAL 2000 LT calibration gas generator has a built-in mass flow sensor that automatically compensates for altitude and temperature resulting in accurate cal gas everywhere you use it. Both the CAL 2000 LT instrument and the calibration gas generating cells are NIST certified + 5% accurate for one year. Instruments and cells can be re-certified at the ACD factory. Best of all, each generating cell provides up to 25 cylinders worth of gas at a fraction of the cost.