The Agreement Level of Colorimetric Indicator Paper and pH Meter Examination Compared to Urine Analyzer in Measuring Exudative Pleural Effusion Fluid pH. J Respirol Indones [Internet]. 2026 Apr. 30 [cited 2026 Jun. 19];46(2):80-9. Available from: http://www.jurnalrespirologi.org/index.php/jri/article/view/1086