Pt-P2O5 lantarki tafkin da asali aka tsara ta Amurka masanin kimiyya Keidel (keidel), saboda haka sau da yawa aka sani da keidel lantarki tafkin, wannan lantarki tafkin da asali da biyu platinum wayoyi daidai shimfiɗa a kan wani polytetrafluoroethylene bututun ciki bango, daga baya canza zuwa fita diamita na φ10 da gilgilashda butbutbututun gilashi, gilashi bututun gilashi jimlar tsawon 150 ~ 155mm, wannan tsarin lantarki tafkin da aka sani da ciki bango irin Pt-P2O5 lantarki tafkin. Ana amfani da shi don auna ruwa mai yawa, ana amfani da shi don auna hydrogen a cikin nau'in SCCH-100 na microcomputer carbon analyzer, ƙonawa ta hydrogen da oxygen don samar da ruwa, sannan ƙididdigar abun ciki na hydrogen ta hanyar amfani da ruwan lantarki ta hanyar dokar Faraday.