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This instrument is a good helper for gardening. It can test the PH value (acidity) of the soil, soil moisture and light intensity. No battery is needed. The probe is about 6.7 inches long Instructions: - When measuring the soil pH and humidity, first insert the probe into the soil as far as possible, leaving about 0.4 inches above the probe. - Move the button on the pen to MOIST, MOIST is the moisture key, the corresponding table is MOIST, DRY is dry, WET is wet, the value 1-3 (red part) indicates that watering is needed, 4-7 (green part) It is suitable, please adjust the watering time according to the variety of plants, 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 table is the value of 8-3.5, ALKALINE is the alkali, ACDIC is the acid, the value 7 is basically neutral, the smaller the number, the greater the acidity. The variety of adjusts the soil pH. - The LIGHT key is the illuminance.The measurement range is 0-2000 lumens.The larger the value, the stronger the light. KINDLY NOTE: 1.When using it, pay attention not to touch the stone when inserting the electrode, do not use excessive force, otherwise it will easily damage the electrode. Wash the electrode after use. 2.This soil tester can not be applied to test pH value of any other liquid. 3.If the soil is too dry the indicator will not move, and water it before testing.