AMCO Clear Turbidity Standards


AMCO Clear® Turbidity Standards

AMCO Clear® Turbidity Standards are recognized by the US EPA as a Primary Standard for the calibration of turbidity meters used both online and in the laboratory for the analysis of drinking water.


Our AMCO Clear Turbidity Standards are traceable to N.I.S.T. Primary Standards due to their consistent particle size and photometric accuracy via UV-VIS spectroscopy. Each lot is normalized to historical lots which were formulated to dilutions of ISO 17034 4000 NTU Formazin. Use the AMCO Product search below to match your instrument and model to the correct standard for your application.

AMCO Clear Turbidity Standards

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  • Safe, non-toxic and disposable
  • Requires no mixing or inverting
  • Easy-to-use/ no dilutions or preparations
  • Stable - does not settle out of suspension
  • Accurate to 1% lot-to-lot
  • Guaranteed one-year shelf life from date of shipment
  • Available in a wide range of values
  • N.I.S.T. traceable
  • EPA method 180.1 approved
  • ISO 17025 accredited
  • Custom standards available

AMCO Clear


Primary Standard Turbidity Meter Calibration Kits include 250 mL bottles of each NTU value at the manufacturer's suggested calibration points.

Secondary Standard Turbidity Meter Kits include sealed vials of the NTU values at the manufacturer's suggested calibration points.

Deluxe Turbidity Standard Kits will contain the 250 mL bottles of primary standards and the corresponding sealed secondary standards at the manufacturer's suggested calibration points. This will also include a new sample vial.

Linear Calibration Standard Kits contain 125 mL bottles of primary standard in the range of your application, 0-1, 0-10, and 0-100 NTU ranges include 6 bottles at 0%, 20%, 40%, 60%, 80% and 100% of the range of interest. Directions and graph paper are included upon request.


Primary Standards are available in 125, 250, 500 mL, 1 L, and 1 Gallon bottles and are instrument specific, formulated to match Formazin dilutions.

Secondary Standards are primary standard suspensions contained in a sealed vial/bottle and used for daily instrument calibration verification.

Best Seller is a low level check standard to verify instrument calibration in the drinking water range of interest.

Reference Information

HF Scientific Reference Items

HF Scientific Reference Brochure

AMCO turbidity standards are instrument specific. Find the Right AMCO product to match the HF Scientific instrument you have by clicking here and downloading our brochure.

Hach Instrumentation

Hach Reference Brochure

Hach turbidity meters are common instruments in any lab. If you are looking for an alternative product, download our new brochure to help you find the correct item for your application and instrument.

LaMotte Reference Brochure

Using a LaMotte instrument and searching for the correct turbidity standard? Try GFS Chemicals AMCO Clear as your go-to option with our superior quality and competitive pricing.