The idea to invent this product is inspired from the problem of wearing songkok for a long period. Normally, after we wear songkok for a certain period, the area inside songkok becomes humid and hot and this will make the head feel itchy and…

Hazardous gas detection is a tool specially developed to detect liquid petroleum gas and natural gas at the minimum concentration of gas in the air is 200 ppm and the maximum concentration of gas in the air is 10 000 ppm. Design and build a…