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This 25-ohm thermometer is the workhorse of the ITS-90 ranges. It can be calibrated for any of the subranges from the triple point of argon to the freezing point of aluminum. The 5681 meets the ITS-90 requirements for resistance ratios as follows: W(302.9146 K) 1.11807 and W(234.3156 K) 0.844235
| Instrument Type | Probe |
| Temperature Range | -328 to 1238 F |
| User Interface | |
| Display Style | None |