KPM Aqua-Boy HMI [HMI] Timber - All Species Moisture (No Electrodes). The Aqua-Boy HM range of moisture meters are specifically calibrated and tailor made for the timber and wood 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