In-Situ Troll® 9500 Multiparameter Instrument

The powerful, portable TROLL 9500 Water Quality Instrument is designed for groundwater and surface water monitoring. The unit houses up to nine water quality sensors, internal power, and optional data logger.

Lower Total Cost of Ownership

  • Instrument saves time and money by offering long-lasting internal power, automated low-flow sampling, and telemetry accessibility.
  • Field-proven sensors and antifouling system reduce maintenance and site visits.
  • Intuitive Win-Situ® 4 Software and Flow-Sense Software improve efficiency by simplifying data collection and management.

Reliable, Accurate Operation

  • Instrument operates in fresh, waste, and marine waters.
  • Instrument offers proven performance. Rigorous third-party testing shows that the TROLL 9500 delivers consistent results.
  • Sensors are factory calibrated with NIST®-traceable standards (where applicable).

Outstanding Customer Service

  • Free manufacturer 24/7 technical support
  • In-Situ 1-800-446-7488

Logging Models

  • LTS: LTS stands for "Level, Temperature, and one additional Sensor," such as conductivity, dissolved oxygen (DO), or pH.
  • Professional: This unit offers the highest value for most applications. Instrument allows for several sensors, including conductivity/salinity, DO, ORP, pH, temperature, or depth.
  • Professional XP: The most capable TROLL 9500 offers features available on the Professional and supports XP or "Extended Parameter" sensors–turbidity, ammonium, chloride, or nitrate.

Non-Logging Models

  • Profiler: Ideal for sampling or vertical profiling, this unit is similar to the Professional, but does not include memory or logging capabilities. Data can be logged to a RuggedReader® Handheld PC or laptop.
  • Profiler XP: This unit offers the same features as the Profiler with the option to use XP sensors.

Close block


  • Coastal deployments – estuaries and wetlands
  • Environmental monitoring and spot checking
  • Low-flow groundwater sampling
  • Remediation and mine water monitoring
  • Stormwater management
  • Vertical profiling