| 500 Series | Metrohm® 827 | Non-Intrusive Reflective |
| Beckman Coulter
| Metrohm USA
| Ocean Optics
|
| pH 1140 | PHB-550R pH Benchtop Meter | sympHony® |
|
| | |
| Mettler Toledo www.mt.com | Omega www.omega.ca | VWR www.vwrsp.com |

| 500 Series | Metrohm® 827 | Non-Intrusive Reflective |
| Beckman Coulter
| Metrohm USA
| Ocean Optics
|
| pH 1140 | PHB-550R pH Benchtop Meter | sympHony® |
|
| | |
| Mettler Toledo www.mt.com | Omega www.omega.ca | VWR www.vwrsp.com |
