Peer review declaration

All papers published in this volume of Journal of Physics: Conference Series have been peer reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing. • Type of peer review: Single-blind / Double-blind / Triple-blind / Open / Other Single blinded for the technical content. Open for the format revision. • Conference submission management system : The submission management system was specially developed to the meeting by a Brazilian company named LT Eventus. • Number of submissions received : 305 • Number of submissions sent for review : 301 • Number of submissions accepted : 108 • Acceptance Rate (Number of Submissions Accepted / Number of Submissions Received X 100) : approx 35% • Average number of reviews per paper : 3 (three) • Total number of reviewers involved : about 90 • Any additional info on review process : Although approx. 300 papers were accepted to be presented at Metrologia 2019, 108 best papers were selected to be published in IOP JPCS. • Contact person for queries : Name : Rodrigo P.B. Costa-Felix Affiliation: Inmetro Email : rpfelix@inmetro.gov.br