Measure the Whole Range!

Aqua TROLL® 400 MP

Multiparameter Instrument

The Aqua Troll 400 Multiparameter instrument is ideal for monitoring water quality in a variety of environmental applications. The instrument leverages In-Situ® Inc.‘s patented EPA-approved RDO® technology.
The compact instrument houses measures with a fixed set of sensores up to 12 parameters.

  • actual and specific conductivity, salinity, total dissolved solids, resistivity, density
  • dissolved oxygen (DO)
  • ORP
  • pH
  • temperature
  • water level and water pressure


  • fresh water
  • marine water
  • process water



  • easy installation
  • long-lasting calibration reduce site visits
  • DO readings automatically compensated for salinity




Technical Specifications

Operating temperature:-5 to 50 °C (23 to 122 °F)
Dimensions:4 (OD) x 26.9 cm
Weight:694 g
Material:PVC, Acetal, Titanium, stainless steel, Viton®, PC/PMMA
Accuracy conductivity: ±1%
Accuracy dissolved oxygen:< 8 mg/L ±0,1 mg/L , <20 mg/L ±0,2 mg/L,  
>20 mg/L  ±10%
Accuracy pressure: ±0.1% full scale
Accuracy pH / ORP:±0.1 pH unit / ±0.5 mV
Accuracy temperature:±0.1°C
Output options:Modbus / RS 485 and SDI-12
Power:8 - 36 VDC  external line power / solar panel



Ordering Details:

Order No. Device 
5050123Aqua TROLL 400Multiparameter probe (incl. press, temp, cond, RDO, pH/ORP)
5050238Wireless Troll Comreadout device with Bluetooth and USB (incl. baro and temperature sensor, battery supply)
5050419Aqua TROLL Low-Flow-Kit 
5050149App /Win-Situ Software all-in-one software package for automatic configuration, simplified calibration, targeted data analysis and automatic reporting (free)
5050075Rugged Android tabletfor field use
on requestAdditional accessoriesWell caps and inserts, cable options/wire suspension



Principal Office Müncheberg

Umwelt-Geräte-Technik GmbH
Eberswalder Str. 58
15374 Müncheberg
Tel.: +49 (0) 33432 7559-0

Branch South

Umwelt-Geräte-Technik GmbH
Munich Airport Business Park
Lindberghstr. 7a
85399 Hallbergmoos
Tel.: +49 (0) 811 124478-0