3-in-1 circular soil tester Single product weight: 87g Product size: 5.5*26*3.5 (probe length: 17.5cm) Packaging: Blister card Single package size: 10*33.2*3.7cm 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. No batteries are required. The probe is about 17cm long. Instructions: When measuring soil pH and humidity, first insert the probe into the soil as deep as possible, leaving about 1 cm above the probe. Turn the button on the pen to MOIST. MOIST is the moisture button. The corresponding one on the table is MOIST. DRY is dry. WET is wet. Values 1-3 (red part) indicate the need for watering. 4-7 (green part) is appropriate, please adjust the watering time according to the variety of the plant. 8-10 (blue part) means it is too wet. Turn 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, the value 7 is basically neutral, the smaller the number, the greater the acidity, please according to the plant Varieties adjust soil pH. The LIGHT key is the illumination, and the measurement range is 0-2000 lumens. The larger the value, the stronger the light. Please decide whether shading is needed according to the variety of the plant. When using, be careful not to touch stones when inserting the electrode, and do not use excessive force, otherwise the electrode may be easily damaged. Clean the electrode after use.