Hanna Instruments

Choosing the Right Hanna Instruments for Your Aquarium:

Hanna Marine Master Test Kit:
A complete testing solution for reef aquarists. This kit includes digital testers for pH, alkalinity, calcium, low-range and high-range nitrate, ultra-low range nitrite, and ultra-low range phosphate. It’s all packed into a durable case with reagents, glass cuvettes, and cleaning tools — making it easy to track key parameters with precision and consistency.

Hanna Alkalinity Checker:
A compact digital colorimeter that provides accurate alkalinity readings in dKH. Much easier to read than traditional titration kits and ideal for fine-tuning dosing schedules for reef tanks.

Hanna Calcium Checker:
This handheld tester delivers reliable digital calcium readings. A favorite among SPS reefers, it simplifies calcium tracking and helps maintain stability in high-demand systems.

Hanna Phosphate ULR Checker:
Designed to detect ultra-low phosphate levels, this checker helps you stay ahead of algae outbreaks and fine-tune nutrient export methods like refugiums or GFO.

Hanna Nitrate HR Checker:
Provides precise nitrate readings in the high range — essential for understanding nutrient buildup, especially in systems with high bioloads or heavy feeding.

Hanna Salinity Tester:
A fast and portable digital tool for checking salinity and specific gravity. Easy to calibrate and waterproof, it’s perfect for regular maintenance and salt mix verification

Optimizing Hanna Instruments Performance

Consistent Testing Routine:
To get the most out of your Hanna Instruments, establish a consistent testing schedule. Check alkalinity and calcium at least 2–3 times per week, especially in SPS-dominant systems. Nitrate and phosphate should be monitored weekly to maintain nutrient balance and avoid swings that can stress corals or fuel algae growth.

Proper Sample Handling:
Always use clean cuvettes and avoid touching the sides to prevent smudging, which can affect readings. Rinse with RO/DI water between tests and dry with a lint-free cloth for accuracy. For testers that require powder reagents, add them slowly and mix well to ensure complete reaction.

Reagent Storage & Shelf Life:
Store all reagents in a cool, dry place and keep bottles tightly sealed. Expired reagents can lead to inaccurate results — always check expiration dates before testing and consider keeping backups on hand for critical parameters.

Data Tracking for Trend Analysis:
Record your test results in a reef log or digital tracking app. Monitoring trends over time can help you spot slow-developing issues and make informed adjustments to your dosing, feeding, or filtration strategies.

Expert Tips

Use a Dedicated Testing Station

Set up a small, well-lit area near your tank for testing. Keep cuvettes, reagents, and syringes organized and easily accessible. A stable surface reduces the chance of spills and helps prevent cross-contamination between tests.

Mix Powdered Reagents Thoroughly

When using powdered reagents, be sure to shake or swirl the cuvette until the reagent is fully dissolved — no undissolved particles should remain. Incomplete mixing can lead to inaccurate readings, especially for tests like phosphate or calcium.

Watch for Reagent Degradation

Powdered reagents can go bad if exposed to moisture or stored for too long, even if unopened. Clumped, discolored, or hard packets should be discarded. Always store them in a cool, dry place and replace expired stock regularly to maintain test accuracy.

Rinse Cuvettes with Tank Water Before Sampling

Swirl a small amount of tank water in the cuvette and discard it before adding your sample. This helps remove any residual RO/DI or cleaning water that could dilute the test and skew results.

Retest Outliers Before Reacting

If you get a surprising result — like a sudden nitrate spike — always retest before adjusting dosing or filtration. Simple issues like smudged cuvettes, leftover reagent, or air bubbles can throw off a reading.

Maintenance Tips for Hanna Instruments

Keeping your Hanna Instruments clean and properly maintained is essential for accurate readings and long-term reliability. These digital testers are precise tools — a little routine care goes a long way.

• Rinse Cuvettes Immediately After Use: Always rinse cuvettes with RO/DI water right after testing. This prevents reagent residue from drying and affecting future tests. Dry thoroughly with a lint-free cloth.
  
  
• Wipe Down Testers Regularly: Use a dry, soft cloth to clean the exterior of your devices. Keep them free from salt creep, fingerprints, and moisture. Avoid using chemical cleaners or exposing units to direct water contact.
  
  
• Store in a Dry, Cool Area: Keep all testers and reagents away from humidity and direct light. Use airtight containers or sealed kits with silica packets to preserve powdered reagents and prevent clumping.
  
  
• Watch for Scratched or Cloudy Cuvettes: Optical clarity is critical. If a cuvette becomes scratched or hazy, replace it immediately — even minor imperfections can impact digital readings.
  
  
• Check Batteries Often: Low power can compromise test accuracy. Always have spare batteries available, especially if you test frequently or use multiple checkers in one session.
  
  
• Discard Expired or Clumped Reagents: Powdered reagents degrade over time, especially if exposed to air or moisture. Replace any that show signs of hardening, discoloration, or uneven texture.