Sealey lambda sensor tester simulator sealey vs925 tests zirconia and titania lambda sensors and ecu suitable for 1 2 3 and 4 wire sensors heated and unheated led display shows crossover signal from sensor simulates rich or lean mixture signals to check ecu response insulation piercing clip for quick and easy connection plus display to confirm wire identity powered by 9v battery not supplied and has low battery indicator sealey vs925 lambda sensor tester simulator