Most industrial processes function only within a specified temperature range. It is imperative in most process and control industries, that the temperature of the power electronic devices be maintained within its operating range for optimum performance. It is therefore important to know the temperature of various devices operating in industrial applications. This paper presents the design and implementation of a Microcontroller Based Temperature Scanner which is a device that can be used to measure temperature and display the temperature in centigrade directly on a seven segment display. It has the ability to measure temperature on eight different channels, provides for automatic scanning for all channels or allows the user the option to select the channel which he wants to scan. The designed device is used for measuring the temperature at different points of a system. The device, with the help of the RS-232 interface to a personal computer, can be used for data logging. It is also to be used along with support control circuitry to provide controller action.