Epoxy body combination pH sensor, with screw-on membrane guard. The Porous Teflon reference system makes this sensor suitable for most water samples, excluding Slurries, Soil Suspensions and other solutions that can clog reference junctions. pH range 0 to 14 pH Temperature Range 0 to 60 0C (32 to 140 0F) Reference System Ag/AgCl, double junction with Porous Teflon junction. Dimensions 120 x 12 mm