9 Gas detection monitors and electrical gas sensors; life saving apparatus and instruments, namely, gas detection monitors and electrical gas sensors; electrical detectors, namely, fire detectors and smoke detectors; alarms, namely, fire alarms and smoke alarms; warning devices, namely, signal bells, electric buzzers and electrochemical cells; electrolysers; gas testing instruments for gas detection monitors and electrical gas sensors; ionization apparatus and detectors, namely, gas detection monitors and electrical gas sensors; measuring apparatus and devices, namely, gas detection monitors and electrical gas sensors; monitoring apparatus, namely, gas detection monitors and electrical gas sensors; probes for scientific purposes; sirens; fire sprinklers; fuel cells; radiation sensitive sensors