1. It is portable, compact, easy to use and the moisture measurement readings are instant. 2. Digital display with back light gives exact and clearly reading although you stay at the somber conditions. 3. It will save time and expense by monitoring dryness and helps to prevent deterioration & decay caused by moisture whilst in storage, therefore processing will be more convenient and efficient. 4. The moisture meter operates by electrical resistance and has automatic temperature compensation. 5. Manual off at any time .Auto power off after 5 minutes from last operation. Data hlold function. Low battery alert. Display:4 digital LCD Measuring range:0-50% Operation condition: Temperature:0-60C Humidity:5%-90%RH Resolusion:0.1 Accuracy: 2%n(Non-saturation condition) Power supply:4x1.5 AAA (Not included batteries) Weight:210g (not including batteries) AL1 and AL2 belong to the alarm setting function, AL1 is the low value setting, the factory default is 13%, AL2 is the setting, and the factory default is 18%. Under the premise that the customer does not adjust the default value, if the water content exceeds 18%, the red light will be on, if the water content is lower than 13%, the green light will be on, and if the water content is between 13% and 18%, the yellow light will be on (we call it safe water). Colour:As Shown Material:Plastic+Metal Size:battery Dimensions:140mmx60mmx22mm, Needle:280mm Package Contents: 1 * PMS710 test Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.