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In designing this new collection of Semi-Standard Platinum Resistance Thermometers, both the customers' needs and the equipment used were taken into consideration. Semi-standard PRTs are typically made in stainless steel sheaths which are 6mm in diameter, and have an Ro value of 100Ω and an alpha [(R100-Ro)/Ro] of 0.00385. A variety of configurations are available, since particular characteristics might be required, such as short sensing length, fast response, or applicability to a particular temperature range. Most of our semi-standard PRTs have been made longer, and have a slightly wider temperature range. They are all constructed with high quality 100Ω detectors, and are assembled and calibrated using fixed point cells in-house in a NAMAS approved and supervised laboratory. These sensors are ideal for a comparison reference sensor in industrial and secondary laboratories.