3-in-1 Plant Moisture Sensor can test soil moisture light and PH (design for testing soil ONLY. Not be used to test pure water or any other liquid) You need to know when to water your soil, check the pH level, determine if the plant is getting enough light Humidity range: 1-10 (dry to moist); Light range: 0-2000 (low light to high light); pH range: 3.5-8 (acid to 8 basic) Compact and portable design for indoor/outdoor use good for the gardener or planter Durable and easy to use, plug and play, no batteries Necessary Soil pH detection: Sometimes it is necessary to detect the pH of plants, which can help you to control soil pH and improve the quality of plant growth environment. Check the light level: Checking the plants sunlight level can let you know if the plant has enough sunlight and help you adjust if the plant needs more sunlight. sunlight. feature: Read scale PH/humidity/light Light sensor Relative light intensity: 0-2000LUX Humidity sensor Red: 1-3 (dry) Green: 4-7 (wet ) Blue: 8-10 (wet) PH sensor Red: 3.5-7PH (alkaline) Green: 7 -8PH (acid) how to use step 1: Push the switch to the humidity / pHght position step 2: Insert the probe into 2- 4 inches from soil (2/3 of the probe) Step 3: Adjust the position of the probe until the pointer on the dial wobbles slightly Step 4: After 10 seconds, please pay attention to the moisture/pH value in the dial Step 5: After each use, remove the probe from the soil and wipe it dry Tips: 1: This floor counter can only be used in the floor. Do not use it to test liquid directly, such as pure water, lemon juice, vinegar, etc., otherwise the probe may be damaged 2: Do not insert the meter soil in very hard soil or touching hard objects, otherwise the probe will be easily damaged 3: The soil meter cannot accurately measure the intensity of the grow light because most bulbs do not have the full spectral range of sunlight. To maximize the accuracy of sunlight readings, point the light sensor on the top of the meter toward the sun 4: Do not insert the probe into the ground p