water meter adapts to measure the liquid ratr and ... resistant Be the same with sea water,ammonia,acetometer,etc.4.Bi-direction Pulse,4~20mADC,total and rate display ... proof Ex d11 BT4/Ex ib 17.spectrum 2,4,6,10,15,25,40,50,80,100, ... .62.5150A604005030040400200A10060080800250A160100012012001.6300A26016001801800Note:Mark "*" means special order. Water meter