This item is a precision instrument, which adopts HFelectromagnetic waves to measure the water content without damaging the objectunder test. Its density grade can be set according different material to increaseits 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 woodmeasurement.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: MD918Moisture Measurement Range: 4%~80% RHAccuracy: 0.5%Power Supply: 3*1.5V AAA Alkaline Batteries (NOT included)Color: BlueSize (L*W): 13*6.8cm / 5.12*2.68inWeight: Approx. 170g/6.0ozPackage list:1 * Moisture Meter1 * Hand BagNote:1. Due to the difference between monitors and light effect, thepictures may not reflect the actualcolor of the item.2. Please allow slight error due to manual measurement. Thanks foryour 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. .