Description: the lambda tester is designed to measure the crossover changes which occur in the closed loop control system. The tester can be used to analyse zirconia or titania type sensor. The tester can simulate the sensor signals to the ecu to verify acceptance of the signals and con??rm that the ecu acts upon these signals. Features:tests 1, 2, 3 and 4 wire sensors.tests heated and non-heated sensors identi??es which wire the tester is connected to, i.e. Ground, heater or ecu supply (where applicable) rich or lean signal simulation to check ecu reactionwire piercing clip for easy connection led light path displays the crossover signals of thelambda sensor low battery indication sealed control switches for workshop environmentdurable abs enclosure specification:battery: 9v, 6f22 or equivalent, alkalinedimensions/weight: 1478129mm/250g.