Honeywell TM001 In/Out Thermometer with Probe Monitors indoor and outdoor temperature as well as temperatures of swimming pools, hot tubs, spas and more Can be programmed to display in either Celsius or Fahrenheit Measures temperatures to as low as minus 58 degrees Fahrenheit and up to 158 degrees Fahrenheit Includes 10-foot cable and probe Measures 2.89 x 3.64 x 1.47 inches (WxHxD)