The Draper ETOT 12V Lambda Oxygen Sensor Tester and Simulator is a professional diagnostic tool designed for testing and simulating both Zirconia and Titania lambda sensors on petrol and diesel vehicles. This versatile device works with 1-4 wire oxygen sensors, whether heated or unheated, making it suitable for diagnostic work across a wide range of modern and older vehicle systems. The tester can simulate both rich and lean fuel mixtures, allowing technicians to monitor the ECU's response and verify proper engine management system operation. An integrated LED display shows the crossover signal from the sensor, providing clear visual feedback during testing. The included wire piercing clamp on the positive lead enables quick connection checks and wire identification without the need to strip insulation, speeding up diagnostic procedures. Ideal for professional mechanics and automotive electricians performing emissions diagnostics, fault-finding on engine management systems, or verifyin