The 5615 is a PRT with an Inconel™ 600 sheath that’s 305 mm long and 6.35 mm in diameter. It is a secondary reference temperature standard designed to bridge the gap between the highest laboratory standards and industrial or second-tier lab locations. It has accuracy of ± 0.012°C at 0.01°C. Constructed with reference-grade platinum wire for excellent stability. Comes calibrated with ITS-90 coefficients.