Starting at $1,647.00
  • Usually ships in 12-14 weeks



  • Temperature range:
    • -328 to 572°F (-200 to 300°C) for 6 inch
    • -328 to 788°F (-200 to 420°C) for 9 & 12 inch
  • Calibrated accuracy ± 0.012°C at 0°C
  • Reference-grade platinum sensing element
  • Accuracy:
    • ±0.024 at -200°C
    • ±0.012 at 0°C
    • ±0.035 at 420°C
  • ±0.01°C drift after 100 hours at max temp
  • 9 second response time
  • Sensor length 28mm (1.1in)
  • NVLAP-accredited calibration included, lab code 200706-0


The Fluke Calibration 5615 Secondary Reference Temperature Standards (formerly Hart Scientific) are field-durable, lab-accurate PRTs that come with a NVLAP accredited calibration.

The 5615-12 is a Platinum Resistance Thermometer (PRT) with an Inconel™ 600 sheath that's 305 mm (12 in) long and 6.35 mm (0.250 in) 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.

The element is constructed of reference-grade platinum wire (99.999 % pure) for excellent stability. The wire is wound in a coil and placed in a mandrel where it's uniformly supported in a manner that virtually eliminates hysteresis. The electrical configuration is a four-wire current-potential hookup that eliminate the effects of lead-wire resistance.

These Inconel™-sheathed probes have a fully supported sensing element, making them more durable than SPRTs. The element is protected in an ultrahigh-purity ceramic case with a hermetic glass seal to improve output stability by locking out moisture and contaminants.

This probe comes calibrated with ITS-90 coefficients, making it compatible with many excellent readout devices, including Fluke Calibration's 1529 Chub-E4, 1560 Black Stack, and 1502A Tweener. It bridges the gap between a 100-ohm industrial RTD and an SPRT.

For those needing faster thermal response, or where diameter and immersion depth are problems, order the 5615-9 or 5615-6. These probes are excellent reference probes for comparison calibrations in a Fluke Calibration dry-well. The sheaths of the 5615-6 and 5615-9 are 4.76 mm (0.188 in) in diameter.

A printout of sensor resistance is provided in 1 °C increments for each probe. The 5615-9 and 5615-12 are calibrated from –196 °C to 420 °C. The 5615-6 is calibrated to 300 °C.