Heavy metal exposure poses a threat to both the natural habitat and human health due to their persistence, ability to accumulate in organisms, and resistance to degradation. Hence, the imperative task of sensing and eliminating heavy metals from the soil ecosystem is vital in order to establish a stable, sustainable, and waste-free ecosystem. This chapter highlights progress in sensing technologies for field mobility. Further, we discussed the revolutionary method for detecting heavy metal ions in biological and environmental samples using low-cost electrochemical and colorimetric nanosensors. It explores advancements in smartphone-operated screen-printed electrodes, plastic chip sensors, carbon fiber paper-based sensors, and microfluidic-based nanosensors. The chapter also discusses future possibilities and the advantages and drawbacks of current nanosensor techniques.