The Ratioparts 99088 FM-3 is a compact and handy wood moisture meter designed for quick and easy measurement of moisture content in wood and various building materials. It features an easy-to-read LCD display, automatic shutdown for battery saving, and a battery status indicator. The meter has a measuring range of 6-42% for wood and 0.2-2.0% for building materials. It operates within a temperature range of 0-40°C and a humidity range of 0-85% RH. With dimensions of 80x40x20mm and a weight of 50g, it is highly portable. It requires 4xLR44 batteries.