Incompatible with K3N panel meter. Accessories for Omron K3HB Series. For K3HB series panel meters. Options include sensor power, relay and linear outputs, and auxiliary input cards for functions depending on the selected meter. This allows you to tailor the meter to the requirements of each application. . Easy to use plug-in option card 1 card per slot 10 V dc Power: Event input option for measuring instrument (K3HB-V) Up to 5 behaviors depending on model