Nowadays as more and more people are suffering from hypertension, the need for routine check-up using Sphygmomanometer for measuring blood pressure is more needed. One among other frequently-used equipment for the check-up is Suction Pump. It is therefore also significant to calibrate the equipment on a regular basis to avoid miss-diagnose or any harm toward the operator. Considering the aforementioned chronology, the researcher was trying to create a pressure calibrator which bases on atmega 8 computer interface as storage system. During the measurement of increasing pressure using Sphygmomanometer, a -2,6 mmHg correction. Further, during the measurement of leakage, the average value resulted from the final task module was 10.25 with 0.5 mmHg difference. Whilst during the measurement of Suction pump pressure, the correction occurred was 39,75 mmHg.