Lola 3 This tester is extremely inaccurate. For example, the pot has totally dry soil (small planter not watered for 2 weeks) but the tester shows 6 on a scale of 0-10. It is just impossible, and I checked the soil which was completely dry. The lumen measurement is also incorrect, indicates 100 lumens pretty much all the time when at home, same if placed by the window on a sunny day or in the entrance when there is not much sun coming in. Waste of money, better invest in a quality domestically made product next time.