Accurate Measurement: ±2.0%, the hygrometer has 2 modes, measures both wood and building materials. The moisture detector comes with 7 calibrated scales that measure different types of materials. High Sensitive Metal Probe: 2 high-sensitivity metal-tipped needles can penetrate the wood to ensure the highest accuracy of moisture measurement. Accurate Measurement, Small Error: There are 4 levels of wood (the maximum moisture content range of wood materials is 6-70%) and 3 levels of building materials (the maximum measurement range of building materials is 0%-15.2%), that is, the measurement range is 7 types. The wood moisture meter is equipped with 2 high-precision pins that easily penetrate the test area and quickly provide you with the moisture content at your measuring point. Professional Meters: Accuracy: ±2.0%. Resolution: 0.10%. Temperature Measuring Range: 0℃~50℃. Ambient Humidity: 20%RH~90%RH. Working Environment Humidity Range: 0℃~40℃. Temperature Unit Setting: Long press the "SET" button after powering on, to switch between ℃/℉. Wide Application: Anti-mold for wood, firewood, brick, paper, etc. The moisture meter is a great tool for homeowners, carpenters, soil planters, and inspectors. It is ideal for use in woodworking, construction, agriculture, and flooring. This product does not come with batteries; you need to purchase 2 AAA 1.5V batteries separately.