Product Description Industrial Scientific Replacement Dual H2S Sensor Pack for Tango TX1 H2S. Do you have a sensor failure or has a measuring range that's all over the place? It might be time to replace it. Repair your Industrial Scientific Tango TX1-2 H2S Gas monitor by purchasing a new genuine Industrial Scientific H2S Sensors.Need some DIY help changing a sensor or just some friendly technical help with repairing your instrument? Call customer service at 1-800-949-7233. You can buy with confidence because Durawear has quick shipping and free technical support to help you install your new H2S Sensors. Also the sensors we sell are always fresh from the factory, no need to worry about getting a sensor that has been sitting on our shelf for a long time.