The feature rich OX-TRAN Model 1/50—an oxygen transmission rate (OTR) analyzer—is designed for simple out-of-the box user installation and is packed with new technology. This includes an absolute coulometric method, built in software to minimize user error, and automatic relative humidity controls. The unit combines accuracy with a new patent pending coulometric method for absolute readings, eliminating the need to calibrate. The OX-TRAN Model 1/50 also comes standard with Quick Start functionality which speeds set-up time. Frequency Modulation RH Control provides faster and automatic relative humidity controls—a feature not typically found even on more expensive units which allows real-life testing conditions.