ALLOSUN 3-in-1 Moisture Meter with Light & Soil PH Test Function Garden Farming Tool This meter is a kind of home meter, it has many kinds of functions,it is 3 in 1 Moisture Light & PH Meter,Photometer,Hygrometer,Acidimeter. The using environment of this meter can be indoor / outdoor plants, gardens and lawns etc. A. Soil Hygrometer &nbsp; Plant the probe shaft into the ground, at 3/4 of its length, between the pot and the plant. Pick up the indicated zone id color on the dial. B. Photometer &nbsp; Put the photometer near the plant, the photo-eye toward the light source &nbsp;; Set the switch on the position of LIGHT. Not to mask the photo-eye, pick up the position of the pointer on the dial. For knowing the specific needs of your plants, consult a specialist. C. PH &nbsp; &nbsp;1)Earth ;Tenderly clean the probe shafts with an abrasive soft paper and dry cloth or a toilet paper. Lightly wipe off the earth and then plant the probe, If the earth is too dry, wet it &nbsp; &nbsp;2)Liquids; &nbsp;Attentions: The tester is not submarine. Only the probe can be planted into the liquid. Note: PH degree can be read after 60 seconds &nbsp;