RKI Instruments GX-6000 Gas Monitor - Standard Version Includes the Alkaline Battery Pack along with the O2,LEL,CO,H2S Sensors. High Range PID sensors reads 0-6000 ppm Low Range PID Sensor Reads 0-50 ppm The GX-6000 is equipped with a strong internal sample pump in addition to advanced safety features. Man-down alarm Panic alarm LED flashlight Large auto rotating LCD display The GX-6000 is a rugged personal gas monitor built for the nastiest environments. Most noteworthy, it is equipped with a removable impact-resistant rubber boot. Dust and water resistant enclosure with an IP-67 rating. 5 bright LED lights on 3 sides of the instrument. View Alarms easily from a variety of perspectives. Vibration and loud audible alarm for immediate notification.