Controllers · Milwaukee Instruments

Milwaukee MA887 Digital Seawater Refractometer fit check

Quick answer

Milwaukee MA887 Digital Seawater Refractometer is a salinity refractometer from Milwaukee Instruments. Listed features: Digital refractometer for natural/artificial seawater; Three scales: PSU (0-50), ppt (0-150), S.G. (1.000-1.114); Automatic temperature compensation, under 2 sec response. It earns its place when it watches a risk the build actually has, such as heater failure, salinity drift, or alkalinity swings.

Milwaukee MA887 Digital Seawater Refractometer: best for systems 5 gallons and up. Specs, compatibility math, sizing risks, and alternatives before you buy.

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$Milwaukee MA887 Digital Seawater Refractometer$

Who it is for

Good fit for

✓ Keepers who test this parameter on a schedule and want a numeric reading instead of color-matching.

Not a fit for

✕ A first purchase before the heater, ATO, and maintenance routine are stable.

Listed features

Digital refractometer for natural/artificial seawater
Three scales: PSU (0-50), ppt (0-150), S.G. (1.000-1.114)
Automatic temperature compensation, under 2 sec response
Auto-calibrate with RODI/distilled water
9V battery, 2-year warranty

Specs checked against bulkreefsupply.com.

Compatibility math

Build role

gear value = risk reduced + maintenance made easier + build fit

Example: Milwaukee MA887 Digital Seawater Refractometer belongs in the plan only if it solves a real stability or maintenance job.

ReefCrafter keeps optional upgrades behind core stability requirements.

Risk notes

Automation can add complexity if the basic heater, ATO, and maintenance plan are not already stable.

Professional fit context

Check probe support, controllable outlets, alerting, redundancy, and setup complexity.
Milwaukee MA887 Digital Seawater Refractometer best for systems 5 gallons and up; confirm that range against the final display volume, sump volume, and livestock plan.

Alternatives to compare

Hanna Instruments HI736 Marine Phosphorus Ultra Low Range (ppb) Checker HC
Budget-tier alternative in the same category.
Hanna Instruments HI758 Marine Calcium Checker HC
Budget-tier alternative in the same category.
Hanna Instruments HI772 Marine Alkalinity (dKH) Checker HC
Budget-tier alternative in the same category.

Full spec snapshot

Category: Controllers
Build tier: Balanced
Estimated price: $155
Tank fit range: best for systems 5 gallons and up
Format: Salinity Refractometer

Questions

What should I compare the Milwaukee MA887 Digital Seawater Refractometer against?

Hanna Instruments HI736 Marine Phosphorus Ultra Low Range (ppb) Checker HC (Budget-tier alternative in the same category); Hanna Instruments HI758 Marine Calcium Checker HC (Budget-tier alternative in the same category); Hanna Instruments HI772 Marine Alkalinity (dKH) Checker HC (Budget-tier alternative in the same category).