AST-45D O2 sensor replaces Analox Model 9100-9212-5A/5AD, AII Model PSR-11-37-D3 and IT Gambert D-08. This sensor fits in Analox Mini O2 and Analox Mini O2-II analyzers. Measures 0-100% oxygen. Sensor has 23-29mV in air. Slip-on front. 42 months expected sensor life at ambient temperature and pressure. Proprietary electrolyte formulation and anode structure of AST sensors ensure full utilization of Pb anode, thus providing longer life without signal drift and minimizing periodic calibration requirement. AST brand sensors are designed and manufactured in the USA.