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So far, the technology has mostly been limited to well-controlled laboratories. However, recently, an easy-to-use transportable refractometer has been constructed. Although its performance has previously been assessed under well-controlled laboratory conditions, to assess its ability to serve as an actually transportable system, a ring-type comparison addressing various well-characterized pressure balances in the 10\u201390 kPa range at several European national metrology institutes is presented in this work. It was found that the transportable refractometer is capable of being transported and swiftly set up to be operational with retained performance in a variety of environments. The system could also verify that the pressure balances used within the ring-type comparison agree with each other. These results constitute an important step toward broadening the application areas of FP-based refractometry technology and bringing it within reach of various types of stakeholders, not least within industry.<\/jats:p>","DOI":"10.3390\/s24010007","type":"journal-article","created":{"date-parts":[[2023,12,19]],"date-time":"2023-12-19T06:03:11Z","timestamp":1702965791000},"page":"7","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Demonstration of a Transportable Fabry\u2013P\u00e9rot Refractometer by a Ring-Type Comparison of Dead-Weight Pressure Balances at Four European National Metrology Institutes"],"prefix":"10.3390","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6824-3111","authenticated-orcid":false,"given":"Clayton","family":"Forss\u00e9n","sequence":"first","affiliation":[{"name":"Department of Physics, Ume\u00e5 University, SE-901 87 Ume\u00e5, Sweden"},{"name":"Measurement Science 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