O2 sensor with SensCheck, increased measuring accuracy in the range of small O2 conc. (eg denitrification) for Eco, Quadro and TecnoLine converters. Scope of delivery with accessory box (ZBK 25i) contains: 2 change membrane heads (WP 25i/2), 50 ml electrolyte solution (ELY/A), 50 ml cleaning solution, 1x cathode cleaner (SF 300), with integrated temperature sensor (NTC), 7 m cable and waterproof plugMeer tonenMinder tonen