Greisinger gmh 55 es ph extension set for ph meter gmh 3511 greisinger gmh 55 es an extension additional set for use with gmh 35x1 series ph meters the set consists of br br b ge 100 universal electrode b br suitable for use with aquarium water fish farming sea water swimming pool water drinking water br measuring range 0 to 15ph 0 c to 80 c br conductivity gt 100 micro s cm br oslash 12 x 120mm shaft br 1m cable br br b gtf 55 b pt1000 temperature immersion