Milwaukee Instruments

MA887 Digital Seawater Refractometer - Milwaukee

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The new Milwaukee MA887 Seawater Digital Refractometer encompasses 3 different types of user selected scales for the measurement of seawater providing for a much more precise evaluation. Each scale is temperature compensated.

  1. PSU - The newest type scale standard – Letters stand for Practical Salinity Units and is fast become the universal standard for seawater measurement
  2. PPT - The old standard of Parts Per Thousand of saturated salt. This is the oldest of the 3 seawater measurements scales
  3. S.G. - The current standard of Specific Gravity hydrometers and refractometers.


The Milwaukee Instruments MA887 digital refractometer is easy to calibrate and easy to read and provides highest accuracy possible for the measurement of seawater 3 specific scales. This is the type of accuracy demanded by today’s professionals and Milwaukee Instruments delivers.


Milwaukee Digital Seawater Refractometer Specifications:

  Range Resolution Accuracy
PSU: 0-50 1 +/- 2
PPT: 0-150 1 +/- 2
S.G.: 1.000 - 1.114 0.001 +/- 0.002
Temp: 0-80C / 32-176F 0.1 C/F +/- 2 0.3 C/ +/- 5F
Calibration: Automatic


pdfMilwaukee Digital Seawater Refractometer Manual

More Information
UPC 810666006007

pdfMilwaukee Digital Seawater Refractometer Manual

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Product Questions

Do you guys sell the calibration fluid for this device?
Question by: Lisa on Apr 6, 2024, 5:47 PM
RODI or distilled water is typically used to calibrate this refractometer! I have attached the manual, please refer to page 8.
Answer by: Grace (BRS Staff) on Apr 26, 2024, 3:44 PM
When I calibrate the machine, the reading is 1.000, not 0 (zero) like the instructions say. The error messages in the instructions do not tell me what to do if a reading of 1.000 shows when trying to calibrate the unit. What is wrong?
Question by: Mary on Oct 29, 2017, 7:23 PM
Hey there,

There are three different settings to read the salinity with this unit. (PSU/PPT/S.G.). It sounds like you have your refractometer set to S.G. - Specific Gravity, which will read down to the 1000th decimal. You can change your reading by pressing the "Range" button until you get to the PPT-Parts per thousand reading, which will read zero at "0" and properly mixed saltwater at "35ppt". :-)
Answer by: Randy on Nov 25, 2017, 9:10 AM
A question on the accuracy..obviously if it's off by .002 that could be detrimental to a reef aquarium in the long run depending on the nominal salinity value. Most reefs are between 1.024-1.026. However a lot of people seem to like this product. What's BRS experience with this? Do you double confirm samples?
Question by: Marc on Dec 24, 2016, 10:29 AM
Great question! There are many of us here that use this meter. We consistently match the same salinity level each time we make a batch, so regardless of the variance our tanks are consistent to the meter. Minor fluctuations within that variance, coupled with the dilution of water volume in each tank, reduce the percentage of salinity swings. :-)
Answer by: Randy on Dec 26, 2016, 4:00 PM
The spec says that the accuracy is +/- 0.002. That is not very good considering my range of interest is between 1.022 and 1.028. Comments?
Question by: Boz on Apr 15, 2016, 3:54 PM
Hi, Does the case come with the Milwaukee refractometer or is it a separate purchase?
Question by: Tony on Feb 18, 2016, 11:09 AM
Great question!
This will not come with the case. Feel free to let us know if you have any further questions!
Answer by: Connor on Mar 2, 2016, 6:33 PM
Do you sell the case that is recommended for it?
Question by: Sam on Oct 4, 2013, 4:57 AM
Hi Sam,
We sure do. I believe this is the case that you are looking for.
Answer by: Bulk Reef Supply on Oct 4, 2013, 4:57 AM