| SINGLE GAS PORTABLE WITH SAMPLE PUMP 
                          MODEL IQ-350 | 
                      
                    
                    
                    
ISTs 
                    Model IQ-350 is a single gas portable instrument which provides 
                    all of the features of the IQ-250 and in addition comes standard 
                    with a built-in sampling pump. Like the IQ-250, it can be 
                    equipped with either a solid state or electrochemical sensor 
                    and can be configured to detect any one of over 150 toxic 
                    and combustible gases. The unit operates 20 hours on 4 C 
                    size alkaline or nicad
                    batteries, or the AC adapter/charger. The IQ-350 weighs approximately 
                    30 ounces, including batteries.