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The stabilities of more than 20 industrial platinum resistance thermometer (IPRT) elements from four manufactures were investigated. All elements were assembled into probes with a sheath, and the assembly technique was found to be important to stability and accuracy. A set of apparatus was set up for the investigation. The test results with different sheathing materials and assembly techniques are compared. Drift rates as low as 0.002°C per 100 hours at 650°C were achieved. Two vital characteristics, thermal hysteresis and dielectric effect, were tested and are discussed in detail. Further improvements to the stability and accuracy of assembled IPRTs are discussed.