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- - Manufacturers: GFS Chemicals
  - Brand: Watermark®
  - SECO Part No: GFS-99661
  - Manufacturer Part No: 99661
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- - Manufacturers: GFS Chemicals
  - Brand: Watermark®
  - SECO Part No: GFS-99720
  - Manufacturer Part No: 99720
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- - Manufacturers: GFS Chemicals
  - Brand: Watermark®
  - SECO Part No: GFS-76771
  - Manufacturer Part No: 76771
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- - Manufacturers: GFS Chemicals
  - Brand: Watermark®
  - SECO Part No: GFS-99691
  - Manufacturer Part No: 99691
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- - Manufacturers: GFS Chemicals
  - Brand: Watermark®
  - SECO Part No: GFS-99651
  - Manufacturer Part No: 99651
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- - Manufacturers: GFS Chemicals
  - Brand: Watermark®
  - SECO Part No: GFS-99721
  - Manufacturer Part No: 99721
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- - Manufacturers: GFS Chemicals
  - Brand: Watermark®
  - SECO Part No: GFS-25991
  - Manufacturer Part No: 25991
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- - Manufacturers: MilliporeSigma
  - Brand: Aquastar™
  - SECO Part No: 1.88011.1045
  - Sold As: 6/Case
  - Manufacturer Part No: 1.88011.1045
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- - Manufacturers: GFS Chemicals
  - Brand: Watermark®
  - SECO Part No: GFS-99594
  - Manufacturer Part No: 99594
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- - Manufacturers: GFS Chemicals
  - Brand: Watermark®
  - SECO Part No: GFS-74954
  - Manufacturer Part No: 74954
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- - Manufacturers: GFS Chemicals
  - Brand: Watermark®
  - SECO Part No: GFS-99821
  - Manufacturer Part No: 99821
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- - Manufacturers: GFS Chemicals
  - Brand: Watermark®
  - SECO Part No: GFS-15172
  - Manufacturer Part No: 15172
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Conductivity Meters, Probes & Accessories

Benchtop Conductivity Meters
Conductivity Electrodes or Probes
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Portable Conductivity Meters

Electrochemistry Test Strips, Standards & Solutions

ISE Standards & Solutions
pH Buffers
Test Papers & Strips
Turbidity Standards & Solutions
Conductivity Standards & Solutions
Dissolved Oxygen Standards & Solutions
Electrode Cleaning & Storage Solutions
Titration Standards & Solutions
pH Standards & Solutions
COD & Nitrate Standards, Reagents & Kits

Chemical Oxygen Demand (COD) Equipment & Supplies

COD Analyzers

pH/ISE Meters, Electrodes & Accessories

Benchtop pH Meters
pH/ISE Meter Accessories
Benchtop pH/ISE Meters
ISE Electrodes
pH Electrodes
Portable pH Meters
pH Meter Accessories

Turbidity Meters & Supplies

Turbidity Meter Accessories
Turbidity Meters

Titration Instruments & Supplies

Karl Fischer Titrators
Titrator Accessories

Dissolved Oxygen (DO) Meters, Probes & Accessories

Dissolved Oxygen Probes
Benchtop Dissolved Oxygen Meters
Dissolved Oxygen Meter Accessories
Portable Dissolved Oxygen Meters

Multiparameter Meters

Multiparameters Electrodes
Benchtop Multiparameters
Portable Multiparameters
Multiparameter Accessories

ORP Meters, Electrodes & Accessories

ORP Electrodes
Portable ORP Meters

Culture Media

Liquid Microbiology Media
Dehydrated Microbiology Media
Media Buffers
Prepared Microbiology Media
Media Supplements

Environmental Systems

Anaerobic System Accessories
Anaerobic Systems

Chemical Safety Cans & Drums

Safety Cans
Drum Accessories
Solvent Waste Systems

Eye Protection

Safety Glasses or Goggles
Lens Cleaning Supplies
Faceshields

Chemical Spill Kits

Spill Control Agents
Spill Absorbent Mats and Pads
Spill Control Kits

Emergency Wash Stations

Eye Wash Stations
Eye Wash Station Accessories

What's New

Lab Fume Hoods & Casework
PFAS Testing Solutions
DWK Everyday Essentials
Laboratory Thermometers

Chemicals & Reagents

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General Chemicals/Reagents
Indicators
Karl Fischer Reagents & Standards
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Silica Gels & Absorbents
Solvents
Specialty

Bottles, Containers & Vials

Bottles
Carboys
Containers
Jars & Jugs
Vials

Chromatography

Autosampler Vials & Closures
HPLC & GC Accessories
HPLC & GC Columns
Syringes - Chromatography
TLC Plates & Accessories

Lab Equipment

Autoclaves & Sterilizers
Balances, Scales & Weighing Supplies
Baths, Chillers & Circulators
Centrifuges
Colorimeters
Desiccators & Cabinets
Evaporators
Furnaces
Glassware Washers
Heating Mantles, Tapes & Cords
Hot Plates & Hot Plate/Stirrers
Incubators
Melting Point Apparatus
Ovens
Petroleum Testing Apparatus
Pumps (non Vacuum)
Water Purification
Refrigerators & Freezers
Shakers, Mixers & Stirrers
Spectrophotometers
Vacuum Pumps

Lab Supplies

Aluminum Foil & Wrapping Film
Ampules & Accessories
Applicators & Swabs
Bags
Beakers
Bench Protectors & Matting
Boiling Beads or Stones
Brushes
Centrifuge Tubes
Clamps
Crucibles
Culture Tubes, Test Tubes, Special Application Tubes
Cylinders
Dishes
Dispensers
Flasks
Funnels
Gloves
Greases & Lubricants
Handcare
Hydrometers & Hygrometers
Lab Jacks
Microscope Slides & Cover Slips
Mortars & Pestles
Pails, Drums & Tanks
Racks & Supports
Samplers & Scoops
Sieves
Spatulas & Spoons
Stirring Rods
Stopcocks
Stoppers
Thermometers
Timers
Tongs
Trays
Tubing
Watch Glasses
Wipers

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Since our founding over 91 years ago, we have been stocking & distributing name brand laboratory chemicals, consumables, equipment, glassware, furniture and instruments to serve the needs of analytical chemists & microbiologists.

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Corporate Headquarters

15 Kent Road
Aston, PA 19014

[email protected]

(800) 770-SECO

(610) 358-2855

(610) 558-1475 fax

Mon-Fri 8:30 AM - 4:30 PM

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Two-Component

Solvents

Reagents-Titrants

Watermark® 99661

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Watermark® 99720

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Watermark® 76771

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Watermark® 99691

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Watermark® 99651

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Watermark® 99721

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Watermark® 25991

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Aquastar™ 1.88011.1045

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Watermark® 99594

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Watermark® 74954

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Watermark® 99821

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Watermark® 15172

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