Voltcraft ph 212 soil ph meter 1 to 13ph voltcraft ph 212 the voltcraft ph 212 soil ph meter is a device for the measurement of the ph value of planting soils and other soft mud like media this device can determine how acidic or alkaline the samples under investigation are in a simple manner the highly precise ph electrode is encased in a special epoxy body which makes the electrode extremely durable thanks to its two point calibration and automatic temperature compensation the device is