Most Accurate 3 in 1 Soil Tester --- Soilster(TM) is the most accurate meter to measure moisture, pH (acidity/alkalinity) and sunlight level of your soil. You will never under/over water your plants ever again!required! Simply insert the probe into soil, wait for some minutes and the meter will provide an instant reading.It has white text with black background for easy reading. There's also color coded system, from red (dry to slightly humid), green (slightly humid to humid), and blue (very humid).The housing is made of premium grade ABS, and the dual probe is made of high strength aluminum and copper that will not break or get rust