This item is a precision instrument, which adopts HF electromagnetic waves to measure the water content without damaging the object under test. Its density grade can be set according different material to increase its measurement accuracy. Features: 1. Measurement through HF electromagnetic waves sensing. 2. Wide measurement range from 4% to 80% RH and high accuracy of 0.5%. 3. Provide 10 grades of wood material density for various wood measurement. 4. Support upper limit setting and overrunning indication. 5. Digital LCD Screen: For clear humidity display. 6. Automatic compensation for environmental temperature. 7. Suitable for measuring water content of bamboo or wood products, cotton, paper, herbal medicines, etc. Specification: Model: MD918 Moisture Measurement Range: 4%~80% RH Accuracy: 0.5% Power Supply: 3*1.5V AAA Alkaline Batteries ( NOT included ) Color: Blue Size (L*W): 13*6.8cm / 5.12*2.68in Weight: Approx. 170g/6.0oz Package list: 1 * Moisture Meter 1 * Hand Bag Note: 1. Due to the difference between monitors and light effect, the pictures may not reflect the actual color of the item. 2. Please allow slight error due to manual measurement. Thanks for your understanding. 3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. .