The LTT is a precision instrument for recording the temperature of two independent temperature probes. Each temperature sensor is enclosed within a 4" stainless steel jacket. The LTT temperature probes are interchangeable, and replacement probes are available. Each temperature sensor cable is 6' long. The LTT can store 21,500 temperature samples when using a single probe. The LTT can store 10,750 temperature samples when using both probes. The temperature difference between probe 1 and probe 2 is also recorded. Sample point capacity: 21500 temperature points for a single probe. 10750 temperature points and temperature difference, when using both probes. Alarms: Over and under alarms for each external temperature probe. Alarms are not available for temperature difference. Calibration: User single point offset calibration is available through software for both temperature sensors. Logger operating temperature range: 32 to 140 degree F (0 to 60 degree C) using alkaline battery, -40 to 150 degree F (-40 to 65 degree C) using lithium battery. Time accuracy: +/-100ppm at 75 degree F. Relative humidity range: 0 to 95 percent RH non condensing. Probe specification: Media compatible 4" stainless steel tip. 6' cable, The probes are interchangeable. Probe temperature range: -50 to 300 degree F (-46 to 150 degree C). Temperature accuracy: +/-2 degree F (1 degree C). Temperature resolution: 0.1 degree F (0.05 degree C). Power source: 9V Alkaline or Lithium battery. Battery life (average use): 20 Months using alkaline battery, 40 months using lithium battery. Measures 3" length by 2-1/2" width by 1-3/32" height, Weight: 2.5 oz (71g). 1 Year warranty.