General Tools T300-36 Analog Soil Thermometer, Long Stem 36 Inch Probe, 0 to 220 degrees Fahrenheit (-18 to 104 degrees Celsius) Range, Ideal for Taking Ground and Soil Temperature for Composting, Gardening and Agricultural Applications PROBE- 3-foot (914mm) extra-long shaft TEMPERATURE RANGE- Measures 0 to 220F (-18 to 104C) EASY TO READ: 3-inch (76mm) wide dial with a clear glass lens RUGGED DESIGN- Rustproof and long-lasting stainless steel probe NPT FITTING- Includes a -inch (12.7mm) National Pipe Tapered thread fitting