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Milwaukee MI405 Ammonia Medium Range PRO Photometer

SKU: 9139-MI405~ea

SKU: 9139-MI405~ea

This product may be backordered. General ETA is 10-14 business days for delivery. Please feel free to contact us: or 1-800-535-3751 to confirm stock / lead time. We appreciate your business!


Milwaukee MI405 Ammonia Medium Range PRO Photometer

The Milwaukee MI405 PRO Photometer is ideal for users in aquaculture, aquariums, environmental and water treatment, and food processing.  The microprocessor delivers fast, repeatable results with accuracy of ±0.30 mg/L @ 5.00 mg/L.  The low maintenance design is paired with easy-to-use reagents.

The MI405 has a built-in timer that ensures appropriate reaction time is used for the chemical reaction.  At the end of the timer, the meter will automatically take the reading ensuring consistency across multiple users.

It also has a built-in indexing indent on the meter which allows for a lock and key fit with the cuvette cap.  This ensures that the cuvette is indexed consistently (same position) in order to maintain the same path length for accurate results.

There is a built-in error messaging display.  This helps the user ensure no mistakes are made in the testing process.  Messages include no cap, over range and under range, light source errors, and zero cal error.   

The MI405 has a simple-to-use zero-point calibration.  Simply insert the unreacted sample cuvette into the chamber, index the cuvette, and press the zero button.


  • Fast, easy-to-read results with large digital LCD readout
  • Accurate to ±0.30 mg/L @ 5.00 mg/L and a range 0.00 to 9.99 mg/L of (NH3-N).
  • Lightweight and portable
  • Easy measurement: just mix the reagent in the sample, gently shake, insert the cuvette, zero the meter, and then press read
  • Simple, easy reagent packets or liquid bottles
  • Easy 1-2-3 instruction steps
  • Auto shut off after 10 minutes of non-use, 9-volt battery included
  • Adaptation of The Nessler Method


  • Ammonia Photometer, Medium Range: 0.00 to 9.99 mg/L of (NH3-N)
  • Resolution: 0.01 mg/L
  • Accuracy ± 0.30 mg/L @ 5.00 mg/L
  • Method: Adaptation of The Nessler Method
  • Light Source: Blue LED 466 nm
  • Light Detector: Silicon photocell and 466 nm narrow band interference filter
  • Operating Environment: 0 to 50 C 32 to 122 F / Max. RH 100%
  • Battery Type: 1 X 9V (included)
  • Auto-off: after 10 minutes of non-use
  • Meter Dimensions / Weight: 7.5" x 4.1" x 2" / 0.84 lbs.
  • Packaging Dimensions / Weight: 12" x 11" x 4.5" / 2.7 lbs.
  • Meter Dimensions / Weight: 191 mm x 107 mm x 51 mm / 1.22 kg.
  • Packaging Dimensions / Weight: 305 mm x 280 mm x 115 mm / 1.5 kg.
  • Glass Cuvettes: MI0001 (2 x included)

Milwaukee MI405 Manual