In-Situ - Aqua TROLL In-Situ - Aqua TROLL RDO Sensors - OVERVIEW
Manufactured by:  In-Situ

In-Situ offers two types of "Rugged Dissolved Oxygen" probes. Both probes are the same, except for the caps, which distinguish whether they will be fast responding (RDO Fast Cap) or more rugged (RDO-X Cap). The two types can be summarized as follows::

1) RDO-X (P/N: 0063450): Made for rugged environmental conditions

2) RDO Fast Cap (P/N: 0038520): Made fast responding for spot-checking

The RDO sensor uses the RDO Technology, the EPA-approved method for optical DO measurement. It provides accurate dissolved oxygen (DO) measurements to streamline monitoring in various applications.

For use with the Aqua TROLL 500 and Aqua Troll 600 multiparameter sondes, the dissolved oxygen probe is one of several interchangeable sensors, even when wet.


  • Dissolved oxygen measurement from 0 to 50 mg/L
  • Rugged DO probe design for a variety of surface water, municipal, and aquaculture applications
  • DO sensor adheres to EPA-approved In-Situ methods: 1002-8-2009, 1003-8-2009, 1004-8-2009


  • Simplified compliance: EPA-approved optical RDO method makes it easy to comply with Clean Water Act, and NPDES permit requirements.
  • Accurate data: Internal data quality IDs ensure you can trust your data.
  • Long-lasting performance: Rugged design stands up to harsh conditions and process environments, with an extended life cap to minimize maintenance.
  • Easy data collection: Use either the RDO-X for rugged environmental conditions or the fast responding, Fast Cap for spot-checking