Kaikaew, E. ., Khumpad, K. . ., Kammesawang, W. ., Supol, D. ., & Paikoompan, T. . (2021). Training Kit for the Performance of Optical . RMUTL Engineering Journal, 6(2), 19–28. https://doi.org/10.14456/rmutlengj.2021.8