This ad is for one Teledyne ISCO 2103CI modem.  I have I have approximately 50 2103CI,

between 50 and 100 Teledyne ISCO 2103C cellular modems, 
 
and I have approximately ten Teledyne ISCO 2103CI 3G ISCO cellular modems.  See separate advertisements for 2103CI and 2103CI "3G"

I also have Teledyne ISCO 2150 A/V modules, Teledyne ISCO 2110 Ultrasonic modules, battery modules, handles and limited sensors. ADS, meters, Marsh McBirney meters, more ads to come. 

If are familiar with ISCO, these 2103C modems run on 2G I believe.  2G is being phased out by many phone companies, but may still be active in limited areas.  The 2103CI is next.  The 2103CI 3G should still be active in many areas.  Check you cell service providers before purchasing.  

WE BUY USED FLOW METERS