ECO pH Duo+M is specially designed for Aquaria and Aquaculture.  This meter lets you perform pH and temperature tests in one go easily, accurately.  No more color comparisons or dripping with color test kits.  Overdosage during adjusting water pH can overload water with harmful chemicals.  With the use of ECO pH+, the user is able to make multiple tests per day and between small dosages during water adjustment. Most importantly, small water adjustment dosages will not shock the fishes which can result in fatalities.  Temperature is another factor to monitor, as higher temperature reduces oxygen in the water which can result in fish leaping off the water.  With such convenience and assurance, the ECO pH Duo +M far surpasses the many tedious tests of cheaper liquid test kits and at the same time work as a thermometer.  The memory function allows advanced users to monitor and track pH and temperature trends over weeks or months.  It is certainly a pH meter value for money!

Recommended pH Ranges for Common Aquarium Fish

Why Testing pH in Your Aquarium Matters ? 

Maintaining the right pH level in your aquarium is essential for the health and
longevity of your aquatic life. pH measures how acidic or alkaline the water is, and
even slight imbalances can stress fish, disrupt biological processes, and affect the
effectiveness of medications or filtration systems.

Key Reasons to Test pH Regularly:

• Fish Health & Stress Reduction: Fish are sensitive to pH fluctuations. An
  unsuitable pH can cause stress, weaken immune systems, and lead to
  disease.
  
• Biological Stability: Beneficial bacteria that break down waste thrive within
  specific pH ranges. A stable pH supports a healthy nitrogen cycle.
  
• Compatibility: If you keeping multiple species, knowing their preferred pH
  helps you create a harmonious environment.
  
• Water Source Variation: Tap water pH can vary by region and season.
  Regular testing ensures consistency.
  
• Early Problem Detection: Sudden pH shifts can signal issues like
  overfeeding, decaying matter, or malfunctioning equipment.

Recommended pH Ranges for Common Aquarium Fish

How Often Should You Test pH in Your Aquarium?

For Most Home Aquariums:

• Weekly Testing is ideal for stable, mature tanks.
  
• Twice Weekly if you' re adding new fish, adjusting water chemistry, or using medications.
  

During Critical Periods:
Daily Testing is recommended:

• After water changes
  
• When introducing new fish
  
• If fish show signs of stress (e.g. gasping, erratic swimming)
  
• When adjusting pH with buffers or conditioners
  

For Planted or High-Tech Tanks:

• 2–3 Times a Week, especially if you're injecting CO₂, which can lower pH
  throughout the day.

For New Setups (Cycling Tanks):

• Every Other Day to monitor fluctuations and ensure a stable environment
  before adding fish

Advanced features:

Displays pH and temperature

• 2-in-1 meter
  Besides pH, the meter also displays temperature at the same measurement
• One-Touch Calibration
  Effortless calibration with a single press of the button.  Always calibrate accurately!
• Automatic Endpoint Reading & Calibration
  Eliminates guesswork!  The unit automatically locks to an endpoint reading during each test and calibration.
  
• Beep Function
  Audible beep with every press of the button and long beep on every completed function and end-point reading.
• Memory Function
  Able to store up to 10 data readings of both pH and temperature, with recall, erase all, or override function.