Braun created this model as an extension to the Minisystem model.
This is a somewhat rare model to acquire. With my particular unit, there was no separate booklet issued for this model even though the blocks like the meter, photo cell, thermister, and other value resistors and capacitors were provided.
The Minisystem and the Mini-Ausbausytem 1 combined created a Grundsystem 8000 model. The regular 90 experiment instruction manual’s first section covering the Grundsystem was sufficient to provide the component descriptions and illustrative experiments. Hopefully, this instruction book shipped with the model and my particular unit was an exception.