That means it is the second feed speed. With external contact (optional) you can switch the feed speed, but even if you don't have external contact there is still a second feed speed setting, so it is printed out in the list.
Related Products & Solutions
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µR10000 & µR20000
The μR series are the compact industrial recorders with the recording widths of 100 mm (μR10000) and 180 mm (μR20000). Measured data can be saved to an SD memory card while recording on chart paper.