A new microneedle-based patch that attaches directly to a plant leaf is able to rapidly measure hydrogen peroxide levels with the help of a biofriendly electrode (ACS Sens. 2025, DOI: 10.1021 ...

This is the promise of microneedle patches (MNP), which are essentially what they sound like. These would also have uses in diagnostics that might one day obliviate the need for drawing blood.