REDOX COMBINATION ELECTRODE FOR ORP MEASUREMENT, ALL APPLICATIONS, WITH PG 13,5 SCREW PLUG CONN., GEL ELECTRO- LYTE, NON-REFILABLE, WITH PLATINUM RING AND CAP. PRECI- SION GLASS DIAPHRAGM, MOUNTING LENGHT 120 MM PRESSURE EQUIPMENT DIREKTIVE F. GAS 1/LIQUIDS 1 ART. 3.3 SEP