Hanna HI-700 Ammonia Low Range Checker

Hanna HI-700 Ammonia Low Range Checker

Hanna HI-700 Ammonia Low Range Checker is a compact digital Hanna Checker for accurate ammonia testing without colour chart guesswork. It is useful for freshwater ponds, koi ponds, aquariums and routine water testing where consistent water quality checks matter.

Hanna HI-700 Ammonia Low Range Checker is a compact Hanna Instruments digital Checker for measuring ammonia in freshwater ponds and aquariums. It is designed to give a clear numerical result rather than asking you to compare test colours by eye, which makes routine water testing much easier to repeat.

This model has a measuring range of 0.00 to 3.00 ppm NH3-N. That makes it useful when you need a quick indication of whether the water is stable, whether a treatment or water change has worked, or whether a filtration or livestock issue needs closer attention.

Hanna Checkers are especially useful for pond keepers, aquarium owners and maintenance teams who want a more consistent result than strips or basic liquid kits. The simple format also makes it easier to keep notes and compare readings over time.

Where this product fits in your testing routine

Ammonia is one of the first parameters to check when fish look stressed, after new fish have been added or after filter maintenance. It is invisible in the water, so a digital result is much safer than guessing from water clarity alone.

Use the result alongside what you can see in the system. Fish behaviour, coral response, pool clarity, chlorine demand, algae growth and recent maintenance all give context to the reading. If a result seems surprising, repeat the test with clean equipment and fresh consumables before making a major change.

For ponds and aquariums, testing is especially important after heavy feeding, new livestock, filter cleaning, algae treatments, medication, large water changes or hot weather. For pools and spas, a consistent test routine helps maintain safe water and prevents chemical adjustments being made blindly.

Using Hanna equipment correctly

Most Hanna digital tests rely on good technique as well as good equipment. Use clean sample containers, avoid fingerprints on optical cuvettes, check that reagents are within date and follow the method timing carefully. Small errors in preparation can make a good instrument appear inconsistent.

A typical Checker test is straightforward: zero the instrument with the sample, add the correct reagent, mix as instructed, place the cuvette back into the checker and read the digital result. The advantage is that the final reading is shown on screen, removing the judgement needed with a colour chart.

Key benefits

• Digital result with no colour chart guessing
• Compact handheld design for quick routine checks
• Suitable for repeat testing and trend tracking
• Useful for confirming water quality before treatment or dosing
• Works with model specific Hanna reagents and standards

Technical details

• Product code: HI-700
• Brand: Hanna Instruments
• Measurement Range: 0.00 to 3.00 ppm NH3-N
• Resolution: 0.01 ppm
• Accuracy: ±0.05 ppm ±5% of reading at 25°C
• Method: Adapted ASTM Nessler method
• Light Source: LED at 470 nm
• Light Detector: Silicon photocell

Compatible consumables and useful extras

For this product, the most relevant extras are Hanna Ammonia Reagents (25 Tests) for HI700 Checker – HI700-25, Hanna Ammonia Checker Calibration Check Set (0.00 & 1.00 ppm) for HI700 – HI-700-11, Hanna Spare Glass Cuvettes with Caps (2 Pack) – HI-731315. These are the products most likely to be needed for regular testing, verification or maintenance, so they have been prioritised in the recommended extras where available.

Choosing the right add-ons is not about buying more for the sake of it. It is about making sure the tester can actually be used when needed, especially if you rely on it for fish health, reef stability, pool safety or professional maintenance.

Helpful Hanna links and compatible products

Use these links to compare similar Hanna products, find the correct consumables and build a more complete water testing routine around this item.

• Browse all Hanna Instruments products
• Browse water testing and purifiers
• View related Hanna ammonia products
• Hanna Ammonia Reagents (25 Tests) for HI700 Checker – HI700-25
• Hanna Ammonia Checker Calibration Check Set (0.00 & 1.00 ppm) for HI700 – HI-700-11
• Hanna Spare Glass Cuvettes with Caps (2 Pack) – HI-731315

Advice from That Pond Guy

We recommend keeping water testing simple, consistent and repeatable. Test at similar times where possible, keep notes of important readings and look for trends rather than reacting to one unexpected result in isolation.

If you are using this product on a pond, aquarium, pool or holding system, think about the whole setup. Filtration, aeration, stocking, feeding, chemical dosing and source water can all affect the numbers. A reliable Hanna reading gives you better information, but it still needs to be interpreted in the context of the system.

Good practice before testing

For best results, use the correct Hanna reagent, calibration standard or care solution for the exact model listed on the product page. Keep cuvettes clean, avoid touching optical surfaces, rinse probes after use and store electrodes correctly so repeat tests remain consistent. Recording results in the same conditions each time also makes it much easier to spot real changes in pond, aquarium, pool or spa water.

Helpful water testing guides

For more background on testing, interpreting results and maintaining stable koi pond water, see these related guides:

• guide to maintaining ideal pond water conditions
• koi water quality guide
• ammonia and nitrite management guide