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The (HP 3) of the InSight Mars mission is an instrument package to measure the Martian geothermal heat flow. The instrument's platinum resistance temperature sensors have been calibrated between −75 and +55 °C, and the absolute temperature uncertainty of the calibration is 10 mK. Temperature differences can be measured with an uncertainty of better than 5 mK. HP 3 determines regolith thermal conductivity by using the HP 3 mole as a modified line heat source, and thermal conductivity can be measured with an uncertainty of better than 4%. Tilt sensors used to determine the attitude of the mole during penetration measure tilt with an uncertainty of better than 0.25°. Key Points: The Heat Flow and Physical Properties Package (HP 3) of the InSight Mars mission is a heat flow probe designed to measure the temperature gradient and thermal conductivity of the Martian regolith to a depth of 5 mTo reconstruct sensor depth, tiltmeters measure the emplacement angle with an uncertainty of better than 0.25°Temperature sensors have been calibrated to measure temperature difference with an uncertainty of better than 5 mK; thermal conductivity can be measured with an uncertainty of better than 4%; all stated uncertainties are 1 σ confidence limits [ABSTRACT FROM AUTHOR]