BlackMenba 3-in-1 Soil Moisture Meter Light Sensor and PH monitor for bonsai gardening Farming 3-in-1:very easy to use - just one switch for the different modes,Can test Moisture / Light / pH Easy to and read, works great and takes the guesswork out of when to water, how much light and pH levels in your soil No batteries are required to operate this probe Help you to determine if plant getting adequate light Package included: 1 X 3 in1 Moisture/Light/PH Tester Meter