DATA LOGGER DEVICE

PROBLEM TO BE SOLVED: To provide a data logger device easy in understanding corrected data, easily returning information to original information when making a mistake in corrective processing, and knowing a reason for correction later when executing the corrective processing. SOLUTION: When inputting a measured value from field measuring instruments 2-1, 2-2,..., 2-n, an input value is preserved in a measured value database 14a (ST1, ST2 and ST3), and the preserving content of this measured value database 14a is displayed. When a certain measured value is corrected, a flag corresponding to a correction value by correction is set up (ST4 and ST5). A value before correction with every measuring point, a value after correction, and a reason for correction are preserved in a correction history database 14b (ST6). When displaying the content of the measured value database 14b, the corrected measured value is displayed by changing a color by referring to the content of the correction history database 14b. A reason for the correction is displayed, and a display before correction can also be made. COPYRIGHT: (C)2004,JPO