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BlackMenbaÂ® 3-in-1 Soil Moisture Meter Light Sensor and PH monitor for bonsai gardening Farming. The device has a switch on the front which switches from ‘Moist’ to ‘Light’ to ‘pH.’ There is also a plant watering guide for many types of plants which groups them by moisture requirements and tells you when you need to water if the meter needle is in either the red or green zone. If the meter is in the blue zone, don’t water any type of plant. The soil is already wet and doesn’t need water Specification: Color: Green Probe length: App180mm Total size: Appr. 260* 58*36mm Material: Plastics + stainless metal Moist readings range: 0 DRY-10 WET Moist value(1-10RH): 1-3(Red): need to water 4-7(Green): favorable moisture 8-10(Blue): too wet Light readings range: 0 DARK-2000 LUMEN Light value(0-2000 Lux): Higher values mean the greater the intensity of the light PH readings range: 8 ALKALIN-3.5A CIDIC pH value(8-3.5): Neutral solution: =7 Acid reaction: Alkaline reaction: >7 How To Use: Step 1: Switch moisture/pH/light position Step 2: Stick the probe into the soil about 2-4 inches Step 3: Adjust the position of the probe until the pointer on the dial swing slightly Step 4: After 10 minutes, Note moisture/pH/light level in the dial Step 5: Remove probe from soil and wipe clean after each use. BlackMenbaÂ® 3-in-1 Soil Moisture Meter Light Sensor and PH monitor for bonsai gardening Farming