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The Type 531 is a 10MHz oscilloscope that accepts letter-series and 1-series plug-ins. It is exactly like Type 535 except it does not have the Delayed Sweep (dual timebase) feature. It was introduced in 1954 simultaneously with Type 535, and superseded in 1959 by Type 531A, which has more convenient controls and a slightly faster (15MHz) vertical amplifier.

There is also a rack-mount 531A, Type RM31A. The RM31A has a sliding chassis so that the scope can be serviced without removing it from a rack.