The Bright Solutions Pro2 Oxygen Sensor Tester, No. E67000, tells the technician if the O2 sensor is operating within specification. With a numeric sensor display, the device tests zirconium and titanium oxygen sensors, and it works on oxygen sensors from single wire up to four wire as well as heated or unheated sensors. The tester takes just minutes to diagnose the O2 sensor, which can improve fuel mileage, decrease driveability problems and erratic engine performance, increase the vehicle's ability to pass emission tests and promote catalytic converter life. Minimal training or experience is required, there is no need to disconnect sensors and the tool comes in a carrying case.