Tests Zirconia & Titania lambda sensors & ECU. Suitable for 1, 2, 3 & 4 wire sensors, heated & unheated. LED display shows crossover signal from sensor. Simulates rich or lean mixture signals to check ECU response. Insulation-piercing clip for quick & easy connection plus display to confirm wire identity. Features a low battery indicator & powered by 9V battery (supplied). Model No. VS925