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This paper introduces a new-style digital plane inclinometer which is based on a kind of MEMS accelerometer and a low power MCU (micro controller unit). Its attainable precision is 0.1deg . The high-performance MCU is used to calculate and compensate the angle. This plane inclinometer can fit the needs of installation, power cost and drive ability in the areas such as robot and aircraft. The calculated angle can be sent by CAN bus, I2C bus, and serial port.