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.
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.