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Type N units with serial numbers from 101 to 220 | Type N units with serial numbers from 101 to 220 | ||
did not come with a probe power connector on the front panel. | did not come with a [[probe power]] connector on the front panel. | ||
A field modification kit was sold to add the probe power connector. | A field modification kit was sold to add the probe power connector. | ||
After serial number 220, probe power was included from the factory. | After serial number 220, probe power was included from the factory. |