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Standard Time base oscillator
Battery Unit (PM 9623) for PM 6685 only
The Fluke PM 6685 Frequency Counter brings calibration lab accuracy to field measurements
The PM 6685 is easy to use, compact, and most important of all, it has today"s smartest input triggering for frequency measurements. The battery option for the PM 6685 maintains oven stability for 20 hours, giving you instant oven performance even after long transportation.