I actually considered getting a PVC tube and gluing a cap on one end, and having a screw on cap on the other, and inserting an air stem into the end. That way I could drop in the sensor in the tube, pressurize it a little, activate the sensor, and check it out before installing it to be sure it worked and read pressure before going through all the effort of installing it. But, as it turned out my sensor that I installed worked fine. However, I may still do this for future installs. It wouldn't tell you the condition of the battery. But, at least you could check the functionality.