[javhert]

I was investigating ORP measurements in water and stumbled into the quantity called the Poise. It seems to be something equivalent to the pH buffer capacity for redox reactions, but information about it seems to be quite low and the quantity being called the same as the viscosity unit doesn't help.

Anyone here has a link or a book reference where the redox Poise is widely discussed?

[Borek]

Don't remember ever hearing the term.

[Babcock_Hall]

I don't know a great deal about it, but it comes up in biochemistry with respect to thiol/disulfide systems.  For example: 
"Measuring the Poise of Thiol/Disulfide Couples in vivo"
Dean P. Jones and Yongliang Liang
Free Radic Biol Med. 2009 Nov 15; 47(10): 1329–1338.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2774737/