Vee Gee Scientific 82160-6 Dial Soil Thermometer, 6" Stainless Steel Stem, 3" Dial Display, -40 to 160-Degree F Large 3" Glass Covered Display Stainless Steel Stem for Durability, 6" Temp Range -40 to 160-Degree F Subdivisions 2-Degree F Calibration: Simple Adjustment Nut on Back