We emphasize on developing low-cost analytical tools for environmental  and agricultural testing. Water and atmospheric pollutants are the environmental problems we currently study. Heavy metals and some toxic radical from those sources impact human health. We also proposed mPADs for rubber protein allergens and fruit maturity assessment. Portable, low-cost sensors horizon availability of the analysis methods to be used in developing countries and remote area with simplicity. Moreover, we recently provided schools with mPADs as a small-scale educational resource.