LinkMejor 3 in 1 PH Moisture Light Sensor Soil Tester Meter for Indoor Plants

Simply insert probe of the meter into the soil to remaining about 10mm outsider, switch to the setting you want to measure and read the scale.For example: Choosing the MOIST, scale of 1-3 (red parts)means needing watering, 4-7(green parts) means suitable, 8-10(blue parts) means that too wet.