Abstract: A sensor control device is connected with a plurality of exhaust sensors including an NOx sensor to be disposed around a catalyst, and is constructed such that a plurality of drive control circuits to be connected in a one-to-one relationship with the individual gas sensors are disposed in one casing. The sensor control device is provided with a communication output section that outputs signals through a digital communication line so that the signal transmissions/receptions with an ECU may be executed through the digital communication line. This digital communication line is physically a one-system cable but can transmit and receive signals of a plurality of kinds with predetermined communication protocols.

Abstract: A 240 volt outlet tester is described. The 240 volt outlet tester includes a housing with three or four prongs extending outwardly from a base of the housing. The prongs are designed so that they can be inserted into either a three or four wire 240 volt outlet. Indicator lights are integrated into the housing. A test circuit is located within the housing. The test circuit is designed to detect whether the 240 volt outlet has been wired correctly. If the 240 volt outlet is correctly wired, all the indicator lights integrated into the housing illuminate. If the 240 volt outlet is improperly wired, one or more indicator lights do not illuminate.