Fuji The Model ZRH is a single component non-dispersive infrared (NDIR) gas analyzer used for measuring CO2 gas. Ease of operation through the use of a microprocessor. It is available in 19-inch rack mount. Requires a clean dry sample.ZRHNDIRRanges:0-10% 0-20% 0-50%Power Requirement:115V~ 50/60 HzApprox. Weight:33 lbs.