The V!SA by Gas Measurement Instruments (GMI) is loaded with features! The V!SA monitors up to 5 gases, simultaneously! And the best part? You can buy different GMI gas sensors, put the sensors in the V!SA, and the unit will automatically adjust to the sensor! This versatility reduces the cost of ownership and makes the V!SA a great unit to work with. The built-in internal pump eliminates the need for a squeeze ball in the middle of your hose for the monitor to read gases in confined space. And when the monitor reads unsafe levels of gases, you will be sure to know with a piercing 95 decibal alarm. No need to worry about an optional case; the V!SA is built with a high-impact rubberized casing that is on the unit all the time! Contact us about the Confined Space Kit and options for additional gas sensors!