Teledyne Analytical Instruments 3110XL details:
The Model 3110 represents the new generation of portable trace and percent oxygen analysis capabilities. It combines a rugged, portable analyzer with the high reliability of trace and percent level sensors. This ensures highly accurate ppm/ percent oxygen readings in a variety of background gases (including hydrocarbons). In addition, the microprocessor-based electronics provide accurate, high resolution readings and easy-to-use features.
