Combined glass pH electrode MA991B/1 Back Catalog number: MA991B/1 Manufacturer: MILWAUKEE ELECTRONICS Availability: In the manufacturer's stock Price on request - + Recommended MA921B/2 Double junction ORP platinum electrode MA921B/2 Price on request MA923D/1 pH/ORP/Temp amplified probe MA923D/1 Price on request MI58P pH/ORP/Temp probe for pH58 Price on request