Тесты... а они точные?
вот еще человек сомневается:I am skeptical about the accuracy of the accuracy test iamong these sensors. I think the accuravy data will be credible if all the sensors read the calibrated gas from the same test chamber at the same time and then AFR readings for each one is compared to the supposed reading of the calibrated gas. The picture 1 in the article shows each sensor is held in free-air at the end of the gas cylinder. I'm not sure if I can believe the test result to be accuarate for all these sensors.
А что касается цены, то да, это ощутимый фактор.