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