Replace your Industrial Scientific M40's oxygen sensor with this high-quality replacement sensor. The 1711-7730 sensor is compatible with multiple models, including 17101213 and 171177. Ensure accurate and reliable gas detection with this durable and long-lasting replacement oxygen sensor. Designed for use in industrial settings, this sensor is part of a range of calibrators and testers that guarantee precision in gas measurement and detection. Ensure your workplace is safe and secure with this replacement oxygen sensor.