Description Specifications: Type:Soil moisture meter/soil pH meter/light intensity meter Material: Plastic Single weight: 103g Single soil instrument size: 33*10.5*4.5CM Probe length: 20.5cm . Package Included: 1pc*Soil moisture meter/soil pH meter/light intensity meter . Feature: This is a product exclusively for export. It does not require a power source. It integrates three functions. It can measure the humidity of the soil, the degree of pH, and the intensity of sunlight required for plant photosynthesis. Easy to use and high quality. This instrument is a good helper for gardening, it can test the pH value (pH) of the soil, soil moisture and light intensity, without battery . Instructions: When measuring the pH and humidity of the soil, first insert the probe as deeply as possible into the soil. (10CM has been uploaded) Move 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 1-3 (red part) indicates that water is needed, 4-7 (green part) It is appropriate, please adjust the watering time according to the plant species, 8-10 (blue part) means too wet. Move the button on the pen to PH, PH is the pH key, the corresponding table is 8-3.5 ALKALINE is alkali, ACDIC is acid, and the value 7 is basically neutral. The smaller the number, the greater the acidity. Please follow the plant Varieties adjust soil pH. 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 plant species. Be careful not to touch the stone when inserting the electrode during use, and do not use too much force, otherwise it will easily damage the electrode. Wash the electrode after use. Soil pH Soil pH is also called soil reaction. It is the acid-base reaction of the soil solution. Mainly depends on the concentration of hydrogen ions in the soil solution, expressed in 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 value Soil pH 4.5 Very strong acid 4.55.5 strong acid 5.56.5 Acid 6.57.5 Neutral 7.58.5 alkaline 8.59.5 strong alkaline 9.5 Very strong alkaline Adjustment of soil pH: 1. Lime is often used to improve acidic soil to neutralize active acid, latent acid and improve soil structure; purple shale powder, fly ash, plant ash, etc. can also be used. 2. Artificial acidification of neutral and calcareous soils, open-field flowers can use sulfur powder (50g/m2) or ferrous sulfate (150g/m2), which can reduce 0.5-1 pH unit. It can also be poured with alum fertilizer. 3. To apply gypsum to alkaline soil, phosphogypsum, ferrous sulfate, sulfur powder, acid weathered coal can also be used.