Moisture tester project rapid kit kits of components to build a functional moisture tester that can be used to tell if pot plants require waterthe kits contain all the electronic components required except the pcbs which are available separately this provides the option to buy ready made pcbs or for students to make their ownthe moisture tester project has been designed as an introduction for key stage 2 amp 3 students to the use of resistors and transistors in circuitsteachers notes