Range: Figure link - link unitless
||Paroutis P, Touret N, Grinstein S. The pH of the secretory pathway: measurement, determinants, and regulation. Physiology (Bethesda). 2004 Aug19: 207-15. p.208 figure 1PubMed ID15304635
||The simplest and most convenient method to
measure organellar pH is through the targeted
delivery of pH-sensitive spectroscopic probes.
||"A pH gradient in the opposite
direction has been observed in the endocytic pathway towards the lysosomes. While early endosomes are thought
to have a pH of around 6.3, lysosomes are much more acidic with a pH of approximately 5.5." (quote from PMID 22768925)