It is incredibly easy to use; just plug in and read. No batteries required. Instantly know when to adjust pH for your garden, flowers, plants both indoor and outdoor. This unit will give you a basic idea of the condition of your soil with respect pH & Moisture. The two most critical conditions of a healthy soil. Be sure to check in several spots around the plant and take an average of the readings. You should be testing moist soil, not soil that has been allowed to dry out all week. Drought conditions will change the pH of the soil, so soil should be moist and have been moist for a few days before testing. This has a long probe because testing should be done 10- 16cms below the surface of the soil bed for a better reading You do not need to over water your garden as this 2 in 1 Soil pH and Moisture Sensor Meter Tester for Outdoor & Indoor Plants Gardens & Grass Lawn can monitor the amount of watering closely. Features : 2-In-1 functions : Tests moisture & PH value by using two 20cms probes High accuracy and quick response : Easy to use and immediate results No battery needed : Just plug in the probe to the soil Compact and portable : small size, it is convenient to use it indoor, outdoor or in your greenhouse Monitor & promote healthy plants : Helps maintain health of your soil & plants Specifications : PH Range: 3.5 - 8 Ph (3.5 - 6.5 ACIDIC, 7 NORMAL, 7-8 ALKALINE) Moisture Range: 1-10 (1-3 DRY, 4-7 NORMAL, 8-10 WET) Dimensions: 5 x 3.5 x 28cm Weight : 0.9kg