Pt100 Model L Low-Temperature Precision Thermometer
(-200 °C to 250 °C)

812,00 1.839,00 

Each eXacal thermometer is supplied in a matching case. Optionally, a high-quality wooden carrying case can be ordered.
Manufacturer: Klasmeier / eXacal
Model: Pt100L


The eXacal precision thermometers are used for precise temperature measurements or as calibration standards.

  • NEW design: gas-tight handle with inert gas filling
  • Temperature range: -200 °C to 250 °C
  • small measurement uncertainties: 11 mK to 13 mK
  • robust alternative to ITS-90 standard thermometers
  • high stability and good calibration capability
  • low hysteresis and drift through inert gas 

New design: gas-tight handle with inert gas filling

The new design of the gas-tight handle allows the thermometer’s protection tube to be filled with a protective gas. This improves the properties of the thermometer and ensures less drift and hysteresis at the extremely low temperatures down to the argon point (-189 °C).


eXacal thermometers are calibrated in our own DAkkS calibration laboratory. The DAkkS accreditation ensures that all calibrations are traceable to national and international standards.

The precision thermometers have been designed so that they can be calibrated very well at temperature fixed points up to the argon triple point. However, calibration can also be done by using the comparison method. Small measurement uncertainties are achieved with the temperature fixed points used. A comparison calibration is done by with ITS-90 standard thermometers as calibration standards in calibration baths and calibration furnaces. The measurement uncertainty is calculated from many components. The largest component are reproducibility, ITS-90 characteristic, selfheating an hysteresis.

Measurement uncertainties

  • Small measurement uncertainties with DAkkS calibration certificate
  • Temperature fixed points from argon triple point -189,3442 °C to tin melting point 231,928 °C
  • ITS-90 Standard thermometer during comparison calibration

Temperature range Method Measurement uncertainty
-189,3442 °C Argon-Triplepoint 12 mK
-38,8344 °C Mercury-Triplepoint 10 mK
0,01 °C Water-Triplepoint 12 mK
29,7646 °C Gallium-Meltingpoint 12 mK
156,5985 °C Indium-Meltingpoint 11 mK
231,928 °C Tin-Meltingpoint 11 mK

The specified measurement uncertainties are k=2, include an ITS-90 characteristic curve and are given for the respective range.


Questions about the thermometer?

    Additional information

    Select calibration

    inclusive DAkkS Calibration, without DAkkS Calibration

    Technical Data

    Model KK-163
    Temperature range  Argon-Triplepoint to Tin-Freezingpoint
     -189,4332 °C to 231,928 °C
    Nominal resistance  Pt100 (100 Ohm)
    Connection type  Four-Wire
    Connection  Bare wires or depending on configuration
    Sheath material  Metal
    Thermometer wire  Silver
    Handle  ∅ 20 mm x 100 mm (new construction: gas tight)
    Diameter  6 mm
    Length  400 mm
    Filling  Inert gas
    Connection cable  2 m
     Measuring resistor / Temperature sensor
    R0  100 Ohm ± 0,05 Ohm ( 1/10 DIN)
    Alpha  0,003850 ± 0,000005
    Norm  IEC 60751:2008
    Length  25 mm
    Recommended Measuring current  1 mA
    Self-heating  5 mK to 10 mK
    Fixed point Calibriation  11 mK to 13 mK
    Comparison Calibriation  15 mK to 25 mK