Model : PH-220S * Complete set with separate soil, spear tip pH electrode and pH 4 and pH 7 standard solution. * Meter : 0 to 14 pH x 0.01 pH. Electrode : 1 to 13 pH. * Auto calibration for pH 4, pH 7 or pH 10. * Temp. adjustment is not necessary. * IP-65 water proof. * Build in reverse display button. * DC 1.5V battery ( UM-4, AA ) x 4, long life. * Spear tip pH electrode, ideal for penetration pH measurements into soil, meats, cheese and other type of measurements requiring sample penetration.