Fluke 5608 Secondary Reference PRTs

Very stable thermometer from –200 °C to 670 °C

• 5608: –200 °C to 500 °C (80 mm minimum immersion)
• 5609: –200 °C to 670 °C (100 mm minimum immersion)
•  NVLAP-accredited calibration, lab code 200348-0
• Dry-well reference with 90 ° bend

If you want a very stable thermometer from –200 °C to 670 °C and are particular about the calibration, then look no further than our 5609 Secondary Reference PRT. Its short-term stability at the triple point of water is only ± 7 mK and its one-quarter inch (6.23mm) diameter lets you get accurate measurements in only 100 mm of immersion.

The 5608 is also a ± 7 mK probe at the triple point of water, but its one-eighth inch (3.18 mm) diameter gets you accurate measurements from –200 °C to 500 °C with only 80mm (3.1 in) of immersion. With multiple sheath length options on both of these probes, you can find the dimensions that are just right for your specific application.