GAS MONITOR;GAS ALERT ALKALINE 4 GAS; NB:-QUATTRO GAS DETECTOR,MUST BE QUOTED & SUPPLIED WITH FOLLOWING ITEMS/ SETTINGS;MUST COME CALIBRATED;A-1 YEAR WARRANTY;B-GAS DETECTOR MUST BE SUPPLIED SET UP WITH THE FOLLOWING SETTINGS;OXYGEN-INSTANTANEOUS TWA(8HR)ALARM 1 19.5% VOL.LOW & STEL (15MIN) ALARM 2 23.5% VOL.HIGH; METHANE -(COMBUSTABLE)% OF LEL INSTANTANIOUS/TWA(8HRS)ALARM 1 5% OF LEL &(15MIN)ALARM 2 N/A;CARBON MONOXIDE-INSTANTANIOUS/TWA