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The Fluke 8508A features 8.5 digit resolution, exceptional linearity, and extremely low noise and stability, producing superior accuracy specifications as low as 3 ppm over one year. But measurements need to be repeatable, and the 8508A delivers that as well, with 24-hour stability as low as 0.5 ppm and a 20-minute stability of 0.16 ppm. This stability is maintained over a wide operating temperature range and achieved without requiring routine auto-cal or self-calibration, which can compromise measurement traceability and history. What's more, Fluke publishes a detailed 8508A Extended Specifications Brochure on www.fluke.com that specifies in absolute and relative terms, allowing you to replace Fluke's calibration uncertainty with those that represent traceability available locally.