Mettler Tolede 
DGi115-SC
Plug & Play combined glass pH electrode
Plug & Play combined glass pH electrode with a fixed ground-glass sleeve junction. The large sleeve junction provides a stable measurement signal thanks to a uniform flow of electrolyte. The junction is hardly blocked by precipitates and is easy to clean. Direct pH measurement and acid/base titrations in aqueous medium. Especially suitable for:
 
Media with low ion concentration (e.g. low ion conductivity water)
Polar solvents such as acetic acids or alcohols (e.g. titration with perchloric acid in acetic acid or with sodium methylate in methanol)

Plug & Play sensor with integrated sensor chip for secure handling.