Yes. The numbers are the ratio of rhodium in a platinum/rhodium alloy. The plus side is 40% rhodium, and the minus side is 20% rhodium. There is no official name, so some manufacturers always put the smaller number first, and others put the positive number first.
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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).