Putra, Y. E., Sulistiyanti, S. R., Setyawan, F. A. and Samosir, A. S. (2021) “Rapidness Characteristics of Ultrasonic Wave Propagation on Eggs Using HC-SR04 Module”, Journal of Engineering and Scientific Research, 3(1), pp. 26 –. doi: 10.23960/jesr.v3i1.72.