Soil moisture meter / soil pH meter / light intensity meter (three functions)It does not require a power supply, it has three functions in one, and it can measure the humidity of the soil, the PH degree, and the intensity of sunlight required for plant photosynthesis Easy to use This instrument is a good helper for gardening It can test the PH value (acidity and alkalinity) of the soil, soil moisture and light intensity without batteries Material: PlasticSingle weight: 103gSingle soil meter size: 33*10 5*4 5CMProbe length: 20 5cm (can not be directly put into the water to measure the water, it will damage the electrode)Please note, friends, please soak the soil with water before inserting the soil, and the probe must be inserted into the soil 2/3 of the depth (above 10CM) to measure it accuratelyInstructions:When measuring soil pH and humidity, first insert the probe as deep as possible into the soil (above 10CM)Toggle the button on the pen to MOIST, MOIST is the moisture button, the corresponding table is MOIST, DRY is dry, WET is wet, the value is 1-3 (the red partPoints) indicate that watering is needed, 4-7 (green part) is suitable, please adjust the watering time according to the variety of the plant, 8-10 (blue part) indicates that it is too wet Toggle the button on the pen to PH, PH is the pH key, the corresponding value on the table is 8-3 5, ALKALINE is alkali, ACDIC is acid, and the value is 7 It is neutral The smaller the number, the higher the acidity Please adjust the soil pH according to the variety of plants The LIGHT key is the illuminance The measurement range is 0-2000 lumens The larger the value, the stronger the light Please decide whether you need shade according to the variety of plants When using, be careful not to touch the stone when inserting the electrode, and do not use too much force, otherwise it will easily damage the electrode Wash the electrode after use Toggle the button on the pen to MOIST, MOIST is the water button, the corresponding table is MOIST, DRY is dry, WET is wet, the value 1-3 (red part) means watering, 4-7 (green part) It is suitable, please adjust the watering time according to the variety of the plant, 8-10 (blue part) means too wet Toggle the button on the pen to PH, PH is the pH key, the corresponding value on the table is 8-3 5, ALKALINE is alkali, ACDIC is acid, and the value is 7 It is neutral The smaller the number, the higher the acidity Please adjust the soil pH according to the variety of plants The LIGHT key is the illuminance The measurement range is 0-2000 lumens The larger the value, the stronger the light Please decide whether you need shade according to the variety of plants Soil pHSoil pH is also known as "soil reaction" It is the acid-base reaction of the soil solution It mainly depends on the concentration of hydrogen ions in the soil solution, expressed as pH A solution with a pH value of 7 is a neutral solution; a pH value less than 7 is an acidic reaction; a pH value greater than 7 is an alkaline reaction Soil pH can generally be divided into the following levels:pH Soil pH