Max-550E Oxygen Sensor price is available in sensotec website.
Max 550E Features:
Range of Measurement: 0 to 100%
Output Range: 10.5 to 15 mV
Zero Offset: ≤ 0.50 mV
Response Time: ≤ 15 s
Linearity: ≤ 2%
Expected Lifetime: 1,500,000 %O2 hours
Temperature Compensation: NTC
Operational Temperature Range: 15˚ to 40˚C
Storage Temperature Range: -15˚ to 50˚C
Humidity Range: 0 to 95% RH, non-condensing
Electrical Interface: 3-pin stereo jack