The tip design protects the bulb from breakage and the gel internal fill solution allows electrode to be installed where others cannot. Rugged PVDF housing with 1/2'' NPT (M) threads withstands temperatures from 23 to 176°F (--5 to 80°C) and pressures to 100 psi. Use for measurements up to pH 13. Models include a 10-ft cable with BNC pH connector. Insertion depth 1''.