TopMix2.Touch package for Ex zone 1, TopMix2.Touch package for Ex zone 1Sartorius TopMix2. Touch Premium Terminal for Ex Zone 1 No two reds are alike finding the exact match requires solid craftsmanship, many years of experience and a feeling for the right color mix. Just one look at the new Sartorius TopMix2. Touch, and youll see why its features define the new benchmarks in the paint mixing room: Its 15 multi touch display along with a compact footprint offers a unique level of operating convenience in Zone 1 Class I,