Milwaukee MA887 Digital Seawater Refractometer

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Take the guesswork out of salinity testing with the Milwaukee MA887 Digital Seawater Refractometer, a precision digital instrument designed specifically for measuring seawater.

Instead of interpreting the line on a traditional optical refractometer, the MA887 provides a clear digital reading in seconds. It's an excellent choice for reef aquariums, saltwater fish systems, coral systems, quarantine tanks and other marine applications where maintaining stable salinity is critical.

The MA887 measures seawater in PPT, PSU and specific gravity, while also displaying temperature and providing automatic temperature compensation.

Digital Salinity Testing Made Easy

Salinity is one of the fundamental parameters of a marine aquarium. The MA887 makes routine testing fast and repeatable without requiring the user to visually interpret an optical scale.

Simply calibrate the instrument, place a sample of aquarium water into the stainless steel sample well and take the measurement.

Key Features

Digital Seawater Measurement
Designed specifically for seawater and marine applications.

Multiple Measurement Scales
Measure salinity in PPT, PSU or specific gravity (S.G.).

Automatic Temperature Compensation
Temperature compensation helps provide consistent measurements across normal operating conditions.

Fast Digital Results
Measurements are displayed digitally in approximately 1.5 seconds.

Stainless Steel Sample Well
Easy-to-access sample area designed for quick testing and cleaning between measurements.

Simple Calibration
Calibration is performed using distilled or deionized water, making routine calibration straightforward.

Battery Powered
Portable design allows the MA887 to be used throughout your aquarium setup without needing a nearby outlet.

Measurement Specifications

Salinity Range: 0–50 PPT
PSU Range: 0–50 PSU
Specific Gravity Range: 1.000–1.114 S.G.
Temperature Range: 0–80°C / 32–176°F
Salinity Resolution: 1 PPT / 1 PSU
Specific Gravity Resolution: 0.001 S.G.
Temperature Resolution: 0.1°C / 0.1°F
Typical Measurement Time: Approximately 1.5 seconds
Power: 9V battery

Specifications are based on manufacturer information for the MA887. Milwaukee MA887 specifications

Ideal For

The MA887 is an excellent testing tool for reef aquariums, marine fish aquariums, coral systems, quarantine systems, frag systems and saltwater mixing stations.

It's particularly useful for aquarists who want the convenience of a digital instrument rather than reading a traditional handheld refractometer.

Available Configurations

MA887 Digital Seawater Refractometer

The standard MA887 provides the digital refractometer itself and included manufacturer accessories.

MA887 Digital Seawater Refractometer + Protective Carrying Case

Get the MA887 along with the MA800 protective carrying case for convenient storage and added protection when the instrument is not in use or being transported.

The carrying case is included only when the case configuration is selected.

Why Choose a Digital Refractometer?

Traditional optical refractometers can provide excellent results when properly calibrated and used, but readings require the user to visually interpret a scale.

The MA887 converts the measurement into an easy-to-read digital result, making it especially convenient for aquarists who test frequently or maintain multiple marine systems.

As with any aquarium testing instrument, proper calibration, clean sampling and regular maintenance are essential for reliable results.

Care & Calibration

Calibrate the MA887 according to the manufacturer's instructions before use and whenever calibration is appropriate.

Always keep the sample well clean and rinse it with suitable clean water between measurements to prevent salt residue or contamination from affecting future tests.

Do not allow saltwater to dry repeatedly in the sample well without cleaning.

Whether you're checking your display aquarium, preparing a fresh batch of saltwater or maintaining multiple reef systems, the Milwaukee MA887 provides fast digital salinity measurements without having to squint through another refractometer eyepiece.