MicroTOL On-Line Turbidity Meter


On-line turbidity meter for real-time water turbidity analysis

Product images are demonstrative and may vary from the physical product.


Water Turbidity Meter MicroTol


  • Quick and easy calibration.
  • Verification in seconds, a complete primary calibration in less than 5 minutes.
  • Low volume sample chamber (30 ml) reduces calibration costs and provides fast turnaround times.
  • Low maintenance and safe design.
  • Simple and easy to use modular design.
  • Bubble rejection system.
  • Eliminates bubbles without delaying response time.
  • Modular microprocessor-based technology, which guarantees a high quality of information.
  • Self-cleaning (except MicroTOL 2 and 5).
  • Automatic and continuous ultrasonic self-cleaning under EPA 180.1 standards for meters and turbidimeter self-cleaning.
Measuring principle
Nephelometry (90°)
Ranging from 0.02 to 10, 0.02 to 100, and 0.02 to 1000 NTU depending on the model.
0.0001 Selectable
2% of the reading or ± 0.02 below 40 NTU (0-500 NTU)
5% of reading above 40 NTU (500-1,100 NTU)
Response time
Adjustable response time (5 to 500 seconds) 0 to 1000 NTU
Standard outputs
Isolated from 4-20 mA galvanic or RS-485
RS-485 Protocols
Modbus, HF Simplebus, HF on-line interface
User alarms
2 User selectable high/low alarms
Light source
White or infrared (LED 850nm)
Operating temperature
0°-50°C (32° to 122°F)
Inlet pressure
1 – 200 psi (built in regulator sets at 15 psi)
Custom multi-line LCD (backlight option)
USEPA, ISO 7027, CE approved, ETL Listed UL 3111-1 and ETL Certification to CSA 22.0 No. 1010-1-92

HF Scientific is the leader in turbidimeters for on-line analysis and measurement.

The HF Scientific MicroTOLS Online turbidimeter complies with EPA and ISO 7027 regulations and standards.

Features include: quick and easy calibration, checks in seconds, low maintenance, safe design that guarantees your instrument always delivers accurate readings, bubble rejection system, automatic and continuous ultrasonic autoclean system (except MicroTOL #2 and #5 models), and data acquisition software system that allows data logging and storage for multiple turbidimeters.