Combined glass pH electrode MA991B/1 Back Catalog number: MA991B/1 Manufacturer: MILWAUKEE ELECTRONICS Availability: In the manufacturer's stock Price on request - + Recommended MA831R Stainless steel temperature probe Price on request MA812/2 Conductivity/TDS probe with 2meter cable(MC 310). Price on request MI58P pH/ORP/Temp probe for pH58 Price on request