TB350 IR

Laboratory accuracy meets portability Add to quotation cart

Part Number 194300


  • Multipath 90° BLAC® with innovative straylight elimination
  • Highest accuracy over the complete range including fast settling mode
  • Measuring range: 0.01 – 4,000 NTU
  • ISO 7027 compliant

Ideal for field and environmental testing, the TB350 turbidity meter delivers the most reliable measurements for low range to high range samples with unreached accuracy over the complete range. Its new Multipath 90° BLAC® sensor technology makes it the best instrument on the market. Get lab accuracy as portable solution.

Supplied with sample cells, silicone oil and ready-to-use T-CAL® calibration standards in carrying case.



  • Drinking Water Treatment
  • Pool Water Control
  • Pool Water Treatment
  • Waste Water Treatment
  • Ideal for field and environmental testing
    Both in the laboratory and on site when analysing the quality of water in drinking or waste water: The TB350 turbidity meter delivers the most reliable measurements for low range to high range samples without sacrificing accuracy, compliant with applicable standards of ISO & US EPA. Featuring the new sensor technology Multipath 90° BLAC, the optical system is engineered with dual detectors to deliver a ratio reading which mitigates common measurement stability issues.
  • BLAC®: The darker the better
    Our experts solved two fundamental problems in turbidity measuring in a patented and unprecedented way.
    The sophisticated arrangement of the two detectors allows the analysis of low and high turbidity samples with unsurpassed accuracy over the complete measuring range up to 4,000 NTU.
    The angle of detection stays at 90° over the entire range. This ensures consistent results at any time, regard-less of the size and shape of the turbidity-causing particles.
    The new BLAC® technology stands for: Backscattered Light Absorbing Cavity.
    The trap (BLAC®) eliminates stray light perfectly and provides extremely accurate results for low turbidity down to 0.01 NTU.
  • Touchscreen interface & function application
    The intuitive full-coloured touchscreen interface makes it easy to perform procedures and interpret results. With function applications, you can navigate between settings and performing that function efficiently. This user interface eliminates common frustrations and errors found with competitive products and guarantees outstanding operating convenience with animated procedures. There are 3 reading modes: single, signal averaging, fast-settling.
  • Data logging & USB
    The data logging capabilities allow you to record the testing location, operator’s identification, time and date along with the measurement. Stored data can be transferred to a computer via USB.
  • Competence in Turbidity
    At Lovibond®, we look out for the little things that make a big difference. On the surface, turbidity analysis is a simple measurement. However, there are many factors that can affect the accuracy of readings or the dependability of an instrument. We obsess about turbidity measurement so you don't have to. Our team of globally recognised turbidity experts work to anticipate and solve operators' struggles with turbidity measurement. 
Model Model WM-040-1004 (IR)
Light Source IR LED (860 nm)
Regulatory Compliance ISO 7027
Measuring Principle Nephelometric (Multipath 90° BLAC)
Measuring Range 0.01 - 4000 NTU (FNU)
Resolution Auto ranging: 0.01-9.99: 0.01 NTU ; 10.0-99.9: 0.1 NTU ; 100-4000: 1 NTU
Accuracy ± 1.8 % of reading + straylight
Repeatability < 1 % or ± 0.01 NTU
Stray Light < 0.014 NTU
Display Units NTU, FNU, Degrees, mg/L Kaolin, mg/L PSL
Response Time 7 seconds
Reading Modes Single, Signal Averaging, Fast-Settling
Calibration Options Full-range calibration from 0 - 4000 NTU
Detector Silicon Photodiode
Ratio Mode Yes
Sample Required 10 mL (0.4 oz)
Display Full-Colour Touchscreen
Display Size 55 x 95 mm (W x H)
Interfaces USB-A
Data Logger 250 measurements, all calibrations, verifications and factory-restore actions
Data Transfer Format .csv
Power Save Mode Yes
Auto – OFF Selectable
Power Supply 4 batteries (AA)
3 NiMH-battery pack (AA)
Universal (90 - 240 VAC), via external power supply
Environmental Conditions Temperature: 0 - 50 °C (32 - 122 °F)
Humidity: 0 - 90 % at 30 °C, noncondensing
Humidity: 0 - 80 % at 40 °C, noncondensing
Humidity: 0 - 70 % at 60 °C, noncondensing
Protection Class IP 67 (Instrument)
Compliance CE
Languages User Interface German, English, French, Spanish, Portuguese, Chinese, Japanese, Dutch, Turkish, Polish
Languages Quick Start Guide German, English, French, Spanish, Italian, Portuguese, Chinese, Dutch, Turkish, Russian
Languages Full User Manual German, English, French, Spanish, Italian, Portuguese, Chinese, Dutch, Turkish, Russian
Dimensions 155 x 83 x 225 mm
Weight 804 g (898 g with four AA alkaline batteries)
Weight with Packaging (898 g with four AA alkaline batteries)
Testparameter Measuring Range Method No.
Turbidity 0.01 - 4000 NTU
Title Online Download Type Format Language Direct Download
Datasheet 194300 - TB350 IR Datasheet PDF (0.20 MB)
Leaflet Turbidimeter TB350 Leaflets PDF (0.51 MB)
Brochure - Competence in turbidity Brochure PDF (2.32 MB)
Instruction Manual TB350 Instruction Manuals PDF (3.94 MB)
Instruction manual Turbidity Standards Instruction Manuals PDF (1.34 MB)
Quick Start Guide TB350 Instruction Manuals PDF (2.54 MB)
EU-Declaration of Conformity TB350 Declaration of Conformity PDF (0.20 MB)
  • TB350 IR in case
  • 2 cuvettes with lids
  • 1 Cleaning cloth for cuvettes
  • 1 Cleaning brush
  • Silicon oil, 15 mL
  • 4 Batteries (AA)
  • 1 T-CAL®-Standard, 5 NTU
  • 1 T-CAL®-Standard, 20 NTU
  • 1 T-CAL®-Standard, 800 NTU
  • 1 T-CAL®-Standard, 4000 NTU
  • 1 Screw driver
  • 1 Quick Start Guide
  • 1 Test Certificate T-CAL®
  • 1 Warranty information
Title SDS Country Direct Download
T-CAL Standard 20 NTU - vial
T-CAL Standard 200 NTU / 800 NTU - vial
T-CAL Standard 4000 NTU - vial
T-CAL Standard 5 NTU - vial

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