Max-250 Oxygen Sensor price is available in sensotec website.
Max 250 Features:
Range of O2 Measurement: 0 to 100%
Output Range: 10 to 15.5 mV
Zero Offset: ≤ 0.50 mV
Response Time: ≤ 15 s
Linearity: ± 1%
Expected Lifetime: > 1,500,000% O2 hours
Temperature Compensation: < ± 3.0% from 15º to 40ºC
Operational Temperature Range: 5˚ to 40˚C
Storage Temperature Range: -15˚ to 50˚C
Humidity Range: 5% to 95% RH, non-condensing