This paper presents an overview of the establishment of the national measurement standard for temperature at METROSERT – the national metrology institute in Estonia. The temperature scale and traceability arrangements are realized in the temperature range from – 40 °C to + 300 °C by means of a group of calibrated standard platinum resistance thermometers and water triple point cells. The linkage of the realized water triple point temperature to the international key comparison value with the expanded uncertainty of 187 μK (coverage factor k = 2) is demonstrated. The established laboratory is capable of providing calibration services to customers by comparison calibration with the expanded uncertainty (k = 2) values of 5 mK in the range from – 40 °C to + 200 °C and 12 mK in the range from + 200 °C to + 300 °C.
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