There are two different measuring accuracies for the trackle sensor:

  • Absolute measurement accuracy of +/-0.1 °C
  • Relative measurement accuracy of +/-0.01 °C

The absolute measurement accuracy means that there can theoretically be  a general shift in the measurements, meaning it is possible that all of the basal body temperature values in a curve could be off by +/-0.1 °C. 

However, this is not relevant for the evaluation because the evaluation is about the relative measurement accuracy:  the relative measurement accuracy is 0.01 °C, which means that the sensor measures your temperature precisely to the second decimal. for the evaluation of the symptothermal method because it determines whether the measured temperature value is rounded up or down for the evaluation.