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MD50 Series Photometers

Accurate, reliable single-parameter water testing for field and laboratory use.


The Lovibond® MD50 Series Photometers provide a compact and dependable solution for routine water quality analysis across a wide range of industrial, commercial and environmental applications.


Available in multiple parameter-specific variants, the MD50 Series combines high-precision optical measurement with straightforward operation, allowing users to obtain accurate and reproducible results using an instrument dedicated to their testing requirements.


With guided operation, integrated data storage and a rugged IP67-rated design, the MD50 Series provides a practical solution for water treatment professionals, laboratory technicians and field engineers working across different testing environments.

Accurate and Reproducible Measurements

Reliable water quality monitoring depends on consistent measurements to support effective treatment control and informed operational decisions.


The Lovibond® MD50 Series uses a high-precision optical system to provide accurate and reproducible photometric results, supporting dependable routine water analysis.


Factory-programmed methods simplify measurement procedures, while user calibration and quick-access favourites provide additional flexibility for different testing requirements.

Designed for Straightforward Operation

The MD50 Series is designed to make routine photometric testing simple and efficient, helping users carry out measurements with confidence in both field and laboratory environments.


Its language-independent interface uses clear symbols and on-screen animations to guide users through the measurement process, reducing the need for complicated operating procedures.


Features including One-Time-Zero (OTZ), quick-access favourites and user-defined method programming help streamline regular testing and support consistent operation across different users and locations.

Flexible Data Storage and Connectivity

The Lovibond® MD50 Series combines reliable measurement with practical data management features, allowing test results to be recorded, transferred and incorporated into routine reporting processes.


With storage for up to 100 results, including date and time information, the instrument helps users maintain organised measurement records as part of regular water quality monitoring.


NFC connectivity enables wireless data transfer to the AquaLX® App, while USB connectivity and CSV export provide additional options for transferring results to a computer for documentation and further analysis.

Robust and Portable Design

The MD50 Series combines a compact handheld format with durable construction, making it suitable for regular testing across industrial, laboratory and field-based environments.


Its IP67-rated enclosure provides protection against dust and water ingress, while protective rubber side panels improve handling and help protect the instrument during everyday use.


Integrated anti-slip feet provide additional stability when testing on a laboratory bench or work surface, allowing the MD50 to be used comfortably in both portable and stationary testing environments.

Dedicated Testing for Different Applications

The Lovibond® MD50 Series is available in a selection of parameter-specific variants, allowing users to choose an instrument suited to their individual water testing requirements.


Depending on the model selected, the range can support applications including boiler water monitoring, cooling water treatment, drinking water analysis, wastewater treatment and disinfection control.


This dedicated approach provides a practical alternative to multi-parameter photometers for users who regularly measure a specific parameter and require straightforward, reliable testing.

Supporting Effective Water Quality Monitoring

Regular water testing provides essential information for monitoring treatment performance, identifying changing water conditions and maintaining effective control of water systems.


By combining precise optical measurement, guided operation and practical data management, the Lovibond® MD50 Series provides a dependable solution for routine single-parameter water analysis.


With its compact design, rugged construction and straightforward testing procedures, the MD50 Series supports consistent water quality monitoring across a wide range of field and laboratory applications.

   Order Code   Parameter Test Parameter Measuring Range
 280100 MD50 Chlorine, tablet reagents Chlorine HR 2 PP
Chlorine HR T 
Chlorine L 
Chlorine PP
Chlorine T
 0.1 - 10 mg/L Cl2
0.1 - 10 mg/L Cl2
0.02 - 4 mg/L Cl2
0.02 - 2 mg/L Cl2
0.02 - 6 mg/L Cl2
280102  MD50 Chlorine LiquidChlorine HR 2 PP
Chlorine HR T 
Chlorine L 
Chlorine PP
Chlorine T
0.1 - 10 mg/L Cl2
0.1 - 10 mg/L Cl2
0.02 - 4 mg/L Cl2
0.02 - 2 mg/L Cl2
0.02 - 6 mg/L Cl2
 280105MD50 Chlorine, powder reagentChlorine HR 2 PP
Chlorine HR T 
Chlorine L 
Chlorine PP
Chlorine T
0.1 - 10 mg/L Cl2
0.1 - 10 mg/L Cl2
0.02 - 4 mg/L Cl2
0.02 - 2 mg/L Cl2
0.02 - 6 mg/L Cl2
 280140 MD50 Chlorine HR (Potassium iodide) Chlorine HR (KI) T
Hypochlorite T
5 - 200 mg/L Cl2
0.2 - 16 % NaOCl
 280120MD50 Chlorine dioxide, tablet reagents Chlorine Dioxide PP
Chlorine Dioxide T
0.04 - 3.8 mg/L ClO2
0.04 - 11 mg/L ClO2
 280125 MD50 Chlorine dioxide, tablet reagents and powder reagents Chlorine Dioxide PP
Chlorine Dioxide T
0.04 - 3.8 mg/L ClO2
0.04 - 11 mg/L ClO2
 280180 MD50 Hazen/A.P.H.A. Hazen 2410 - 500 mg/L Pt
 280130 MD50 Ozone, tablet reagents Ozone PP
Ozone T
0.015 - 1.2 mg/L O3
0.02 - 2 mg/L O3
 280135 MD50 Ozone, powder reagents Ozone PP
Ozone T
 0.015 - 1.2 mg/L O3
0.02 - 2 mg/L O3
 280160 MD50 UreaUrea T
Urea T
0.1 - 2.5 mg/L Urea
0.2 - 5 mg/L Urea
 280170 MD50 Suspended solidsSuspended solids 24 10 - 750 mg/L TSS
 280191 MD50 Molybdenum, tablet reagentsMolybdate HR PP
Molybdate LR PP
Molybdate T
1.6 - 40 mg/L Mo
0.05 - 3 mg/L Mo
1.5 - 30 mg/L Mo
 280195 MD50 Molybdenum, powder reagentsMolybdate HR PP
Molybdate LR PP
Molybdate T
1.6 - 40 mg/L Mo
0.05 - 3 mg/L Mo
1.5 - 30 mg/L Mo
 280200 MD50 Copper, tablet reagentsCopper PP
Copper T
Copper VLR
0.05 - 5 mg/L Cu
0.05 - 5 mg/L Cu
2 - 210 µg/L Cu
 280205 MD50 Copper, powder reagentsCopper PP
Copper T
Copper VLR
0.05 - 5 mg/L Cu
0.05 - 5 mg/L Cu
2 - 210 µg/L Cu
 280210 MD50 Phosphate, tablet reagentsPhosphate LR T
Phosphate PP
0.05 - 4 mg/L P
0.05 - 2.5 mg/L PO4
 280215 MD50 Phosphate, powder reagentsPhosphate LR T
Phosphate PP
0.05 - 4 mg/L P
0.05 - 2.5 mg/L PO4
 280230 MD50 CODCOD HR TT
COD LMR TT
COD LR TT
COD MR TT
COD VLR TT
0.2 - 15 g/L O2
15 - 300 mg/L O2
3 - 150 mg/L O2
20 - 1500 mg/L O2
2 - 60 mg/L O2
 280220 MD50 Manganese, tablet reagentsManganese HR PP
Manganese L
Manganese LR PP
Manganese T
0.1 - 18 mg/L Mn
0.05 - 5 mg/L Mn
0.01 - 0.7 mg/L Mn
0.2 - 4 mg/L Mn
 280225 MD50 ManganeseManganese HR PP
Manganese L
Manganese LR PP
Manganese T
0.1 - 18 mg/L Mn
0.05 - 5 mg/L Mn
0.01 - 0.7 mg/L Mn
0.2 - 4 mg/L Mn
 280150 MD50 Monochloramine, powder reagentsChloramine (M) PP
Chlorine (free) and Monochloramine
0.02 - 3.27
0.02 - 3.27 mg/L Cl2
   SpecifcationDetails
Instrument type
Single-parameter photometer
Optical systemLED, spectrometer sensor; interference filter on selected variants
Light sourceLED
WavelengthModel-dependent, 415–680 nm
Photometric range0–3 Abs
Photometric accuracy±3% full scale (20–25 °C)
DisplayBacklit LCD
 Operation Foil keypad
 Sample vials 13 mm, 16 mm and 24 mm round cuvettes, depending on method
 Calibration Factory and user adjustment
 Protection rating IP67
 Power supply 2 × AA batteries
 Battery life Approx. 5,000 measurements without backlight
 Operating conditions 5–50 °C, 30–95% RH (non-condensing)
 Dimensions 155 × 76 × 45 mm
 Weight 247 g
 Compliance CE

Data Management & Connectivity

   FeatureDetails
Internal memory
100 measurement records
Wireless connectivityNFC
Mobile appAquaLX®
PC connectivityUSB-C
Data exportCSV
User-defined methodsSupported through PC software
Software updatesFirmware and method updates
Automatic shut-offYes

MD50 Brochure

Product Codes