KPM Aqua-Boy TEFI [TEFI-KIT] Tea Moisture Meter Kit (All Electrodes).The TEF range of tea moisture meters are calibrated and tailor made specifically for the tea industry. Aqua-Boy moisture meters analyse the moisture content of solid materials in a host of applications. Easy to use and highly portable, these compact meters deliver instant results with an accuracy of 0.1%. Recommended by official test and research laboratories, Aqua-Boy moisture meters are the automatic choice of industrial specialists and scientists worldwide.