Max-250esf Oxygen Sensor price is available in sensotec website.
Max 250esf Features:
Range of O2 Measurement: 0 to 100%
Output Range: 12 ± 2 mV
Zero Offset: ≤ 0.20 mV
Response Time: ≤ 5 s
Linearity: ± 3%
Expected Lifetime: > 500,000% O2 hours
Operational Temperature Range: 0˚ to 40˚C
Storage Temperature Range: -20˚ to 50˚C
Humidity Range: 5% to 95% RH, non-condensing