Continuous Monitoring for a Healthier Marine Aquarium

Keep a constant eye on your aquarium's most important water parameters with the Hanna HI981520 Marine Monitor. Designed specifically for saltwater aquariums, reef systems, mixing stations, and marine aquaculture, this advanced monitor continuously displays pH, marine salinity, and temperature on a large, easy-to-read LCD screen.

Instead of constantly reaching for handheld testers, the HI981520 provides 24/7 real-time monitoring, allowing you to quickly spot changes before they become problems. Built-in programmable high and low alarms notify you whenever pH, salinity, or temperature moves outside your desired range, giving you peace of mind whether you're home or away.

The monitor features a durable HI1286 double-junction pH electrode along with an integrated marine conductivity and temperature probe. Automatic temperature compensation ensures dependable salinity measurements, while simple calibration procedures make setup quick and maintenance easy.

Whether you're maintaining a thriving SPS reef, a fish-only marine aquarium, or a professional coral grow-out system, the HI981520 delivers the continuous monitoring needed to help maintain stable water conditions.

Key Features

• Continuously monitors pH, Marine Salinity, and Temperature
• Large backlit LCD for easy viewing
• Programmable high and low alarms for all monitored parameters
• Simultaneous display of all three measurements
• Automatic Temperature Compensation (ATC)
• Waterproof probes designed for long-term aquarium use
• Manual or automatic two-point pH calibration
• Automatic one-point salinity calibration (35.00 ppt)
• Durable IP65-rated enclosure
• Ideal for reef aquariums, fish-only systems, mixing stations, and aquaculture facilities

Perfect For

• Reef Aquariums
• SPS Reef Systems
• Mixed Reefs
• Fish-Only Marine Aquariums
• Saltwater Mixing Stations
• Coral Grow-Out Systems
• Professional Aquarium Maintenance
• Marine Aquaculture

Specifications

• Model: HI981520
• pH Range: 0.0–14.0 pH
• pH Resolution: 0.1 pH
• pH Accuracy: ±0.2 pH
• Salinity Range: 0.0–70.0 ppt
• PSU Range: 0.0–70.0 PSU
• Specific Gravity Range: 1.000–1.041 S.G.
• Temperature Range: 32.0–122.0°F (0.0–50.0°C)
• Temperature Accuracy: ±0.5°C (±1°F)
• Automatic Temperature Compensation
• Protection Rating: IP65
• Power Supply: 12 VDC Adapter (Included)

What's Included

• Hanna HI981520 Marine Monitor
• HI1286 Double-Junction pH Electrode
• Conductivity & Temperature Probe
• pH 7.01 Calibration Solution (2 Sachets)
• pH 10.01 Calibration Solution (2 Sachets)
• 35.00 ppt Salinity Calibration Solution (2 Sachets)
• Electrode Cleaning Solution (2 Sachets)
• Suction Cup Mounts
• Self-Adhesive Fasteners
• 12V Power Adapter
• Probe Quality Certificate
• Instrument Quality Certificate
• Quick Start Guide

Why You'll Love It

Water parameter stability is one of the keys to long-term reef success. The HI981520 gives you constant visibility into your aquarium's pH, salinity, and temperature without the need for repeated manual testing. Built-in alarms help you catch issues early, while continuous monitoring provides added confidence when you're away from your aquarium.

Why Buy from Infinity and Beyond Aquatics?

At Infinity and Beyond Aquatics, we offer trusted equipment chosen by experienced reef hobbyists and professionals. The Hanna HI981520 is an excellent solution for aquarists looking to simplify monitoring while maintaining stable water conditions for healthy fish and thriving corals.

Shipping Information

Shipping Available Nationwide

This item ships within 1–3 business days, and tracking information will be emailed as soon as your order ships.

• FREE Standard Shipping on qualifying orders over $100 (U.S. only)
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• This item is carefully packaged to help ensure it arrives in excellent condition.