Manufacturer : Advantek Instruments 
Material : Borosilicate Glass bottle (2) , Threaded teflon cover (2),  4 Threaded teflon rods in each bottle, One of these eight threaded teflon rods are fitted with septum to take out gas deposited inside bottle (Photo given).  In other teflon rods , electodes can be fitted as per customers' choice. 
H- cell of different volumes as per scientists' requirement can be made.