Moisture/pH Testers in One Set - Clear reading dashboard with arrow pointer, wide scale interval, and large number. Lightweight and portable, making it convenient for on-the-go testing.No Battery Required -- Save you from changing the battery, simply plug and play. Kindly note that DO NOT leave the meter in the soil for a long time, prevent it from corroding.Single Probe Detection -- Make it easier to insert into the soil and lessen damage to the probe and get you more accurate data quickly. If the soil is too dry the probe will not move, water it before testing. Otherwise, it is easy to damge the probe causes the product not work. And insert the probe into the soil about 2-4 inches.Regarding pH Value -- To get the relative pH value close to the absolute value, soil moisture should be between 4 and 7. the margin of error between relative and absolute PH value is around 1-2.Quality Assurance -- Any quality issues, please feel free to contact us. NOTE: DO NOT use it to test liquids.