other hand the microcomputer 31 controls a power supply to the load cells 23 the amplifiers 34 and the ad converter 32 to the load cells 23 the amplifiers 34 the microcomputer 31 and the ad converter 32 a power is supplied from the battery 35 via the dc dc converter 33 the dc dc converter 33 converts a voltage value of a dc current drawn from the battery 35 into a different voltage value so as to be outputted to the load cells 23 the amplifiers 34 the microcomputer 31 and the ad converter 32 when a power is supplied each of the load cells 23 outputs a signal indicating the inputted load the signal is amplified by each of the amplifiers 34 and the amplified analog signal is converted by the ad converter 32 into a digital signal so as to be inputted to the microcomputer 31 identification information of each load cell 23 is assigned to a detection value of the load cell 23 so as to be distinguishable from detection values of the other load cells 23 as described above the microcomputer 31 can obtain data indicating the detection values of the four respective load cells 23 at the same time then the data indicating the detection values of the respective load cells 23 is transmitted from the microcomputer 31 to the external apparatus via the connector 13 next a weight applying unit used in.