RKI’s GX-2003 five-sensor personal gas monitor with pump pulls samples from up to 50 feet and measures 100% volume combustibles as well as LEL, O2, CO and H2S. Weighing 11 ounces, the unit’s LCD displays all gas readings, battery level and time. Standard alarms include vibration, visual and audible. Operates on Ni-Cad pack or AA alkaline batteries.RKI Instruments, Inc., Hayward, CA.