Multi-Parameter - In-Situ Inc Troll 9500

This multiparameter recording instrument enables 'quick calibrations', automated low-flow sampling, has field-replaceable sensors and a long-lasting internal power source.

It measures barometric pressure, temperature, water level, pH, redox potential, dissolved oxygen and electrical conductivity.

Its optical dissolved oxygen sensor reduces maintenance and the need to visit the site.

It has a corrosion-resistant housing suitable for fresh, waste, and marine waters. The battery compartment and cable connector are IP67-rated, even when detached. 

You can easily replace sensors in the field, simplifying maintenance and calibration.

Each unit comes with a NIST-traceable report. 

Research subject: Instrumentation