ORP meter MW500 Back Catalog number: MW500 Manufacturer: MILWAUKEE ELECTRONICS Availability: In the manufacturer's stock Price on request - + Recommended HI98127 pH tester pHep® 4 Price on request C65 Waterproof conductivity tester, 0 to 1999 μS/cm Price on request HI 98308 Water Purity Tester, 0.0 to 99.9mS/cm Price on request