The 3 Way Soil Meter Is Simple To Use & Gives You Clear Readings On The Soil Ph, Moisture & Light Levels Of Your Vegetable Plot. Quickly & Easily Determine If Your Soil Conditions Are Too Acidic Or Alkaline, To Dry Or Wet & If It Receving Enough Light & Then You Can Alter The Soil Conditions Accordingly Or Decide Which Plants Are Best Suited To The Conditions. the 3 Way Soil Meter Has 17cm Probes Which Easily Push Into The Soil & The Solid Plastic Casing Makes This A Durable & Invaluable Addition To Your Garden Tool Collection. three Way Meter: Moisture/light/ph.the Soil Ph Meter Tests The Acidity Of Soil & Enables You To Alter Soil Conditions.moist Readings Range: 0 Dry To 10 Wet.light Readings Range: 0 Dark To 2000 Light.ph Readings Range: 8 Alkaline To 3.5 Acidic.probe Length: 17cm.