ThermoProbe TL3-R Portable Stem Thermometer – Precision Reference

The Intrinsically Safe TL3-R is ThermoProbe’s highest accuracy hand-held reference Thermometer. The TL3-R has been certified to the latest global standards for hazardous locations (Ex).

Available with Bluetooth connectivity, the TL3-R can be used in applications where extreme accuracy is required. It is powered with 2-AAA batteries providing excellent battery life. A large display and easy to hold design makes the TL3-R convenient for use as a reference in the lab or field. The rugged, weather resistant case and buttons are well suited for use in industrial applications, even with gloves. The TL3-R precision circuitry provides excellent temperature accuracy, battery life and Bluetooth monitoring.

Data Sheet



  • Accuracy +/-0.05°F (0.03°C) over standard calibrated range
  • Standard 5 point calibration: -4°F(-20°C), 32°F(0°C) , 120°F(49°C), 199°F(93°C) & 300°F(149°C)
  • Resolution: 0.001 Degrees
  • Range: -40°F to 400°F (-40°C to 204°C) Note: Standard calibration does not provide full range accuracy
  • Custom calibration points and ranges available.
  • Temperature time constant: 10 seconds in circulated water bath (time response to 63.2% of temp. step change)
  • Recommended minimum immersion depth: 4″ (10.2cm)

Interface Features:

  • 0.5″ (12.7mm) character LCD
  • Switchable units °C or °F
  • Resolution 0.01 or 0.001
  • Bluetooth Wireless Transmitter
  • Low Battery & Fault indication
  • Zero Correction Mode
  • Continuous operation or Auto Off after 20 minutes.
  • Stores and displays Average, Lowest & Highest readings.
  • Arrows indicating increasing/decreasing temperature.
  • Recommended ambient temperature range: 32°F to 112°F (0°C to 44°C)


  • Weather Resistant Enclosure
  • Stainless steel RTD temperature sensor
    – 100Ω Precision wire wound platinum RTD
    – Standard 8″(20cm) or 12″(30cm) lengths
    – Standard 0.25″(6.35mm) diameter
  • Static-dissipative plastic housing with a durable polyester graphics window.
  • Nominal body dimensions: 5 x 1.75 x 1.15″ (13 x 4.4 x 2.9cm)
  • Nominal weight: 5.5 oz (156 grams)