Phosphorus Ultra-Low Range Checker - Colorimeter - Hanna Instruments

The Hanna Instruments HI736 Checker HC (Handheld Colorimeter), often called the Hanna ULR phosphate checker, provides a simple, accurate, and cost-effective way to measure phosphorus in marine systems, including reef tanks. Hanna designed it as a more accurate alternative to chemical test kits, with quick results and a portable, one-button design.

Why Choose the Hanna HI736?

• No color matching: the colorimeter reads your sample and displays a direct phosphorus result
• Simple one-button design that makes getting results easy
• Dedicated to a single parameter: ultra-low range phosphorus
• Small size, big convenience: a portable handheld meter you can take anywhere
• An upgrade from standard test kits for hobbyists who want more precise readings
• Versatile: ideal for aquariums, environmental testing, aquaculture, and water quality

Why Test Phosphorus in Your Reef Tank?

Phosphorus is an important parameter to measure in aquariums and aquaculture. Levels that are too high can lead to extensive algae growth and depleted dissolved oxygen, and they can ultimately be fatal to many types of fish and aquatic life. Testing on a regular schedule helps you spot rising levels early, so you can respond with changes to feeding, filtration, or nutrient export before a problem takes hold.

Handheld Colorimeter vs. Chemical Test Kit

Standard test kits have limited accuracy because they rely on you to match colors by eye. A Hanna Checker takes that step out of your hands: the meter evaluates the sample and shows a numeric phosphorus result on its display. For reefkeepers tracking low nutrient levels, that means results you can compare from one test to the next without second-guessing a color card.

Hanna HI736 at a Glance