PTI QuantMaster name is missing an "a", really PTI QuantaMaster spectrofluorimeter. We are sticking with QuantMaster 1 and 2 as the names of our instruments,
PTI was acquired (years ago) by Horiba, their current (mid-2019) product web page is
We have an older model, with a set of custom designed chambers for gut epithelial monolayer pH studies.
The "QuantMaster" 1 and 2 are mostly used by Prof. Mark Donowitz and Prof. Ming Tse's labs, online scheduler hosted by Ross Fluorescence Imaging Center.