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 (8HRS)ALARM 1 30PPM & STEL(15MIN)ALARM 2 60PPM;HYDROGEN SULPHIDE-INSTANTANIOUS/TWA(8HRS)ALARM 1 10PPM & STEL(15MIN) ALARM 2 15PPM;**NB-GAS DETECTORS MUST BE SUPPLIED WITH CURRENT CALIBRATION CERT;RESTRICT ISSUE ASSET SERVICE MGR PSN 9583;