Metravi PH-700 Digital pH Meter

A. Product Overview

The Metravi PH-700 is a high-sensitivity digital pH meter developed for quick and convenient liquid-quality testing. It measures the acidity, neutrality or alkalinity of a liquid and displays the pH value and temperature simultaneously on its digital screen.

The meter has a measuring range of 0.00 to 14.00 pH, covering the standard pH scale used for water and liquid analysis. Its 0.01 pH resolution enables users to observe small changes in pH, while its specified accuracy is within 0.05 pH under suitable testing conditions.

The PH-700 features a high-definition negative LCD that can be read in normal and low-light environments. Its compact, lightweight and pocket-sized construction makes it suitable for field testing, routine inspections and on-site water-quality checks.

A detachable glass electrode is provided for sensing hydrogen-ion activity in the tested liquid. The electrode can be replaced when required, helping extend the practical working life of the instrument.

Key Features

• Measures pH and temperature simultaneously
• pH range from 0.00 to 14.00
• Resolution of 0.01 pH
• Specified accuracy within 0.05 pH
• Temperature range from 0 to 60 degrees Celsius
• Three-point automatic calibration
• Automatic identification during calibration
• High-definition digital LCD
• Detachable and replaceable glass electrode
• Compact and lightweight design
• Four LR44 button-cell power supply
• Three calibration buffer powders included
• Approximate weight of 88 grams
• Dimensions of 185 mm by 40 mm by 20 mm

The product specifications and primary applications are provided in the Metravi PH-700 catalogue.

B. Working Principle

The Metravi PH-700 Digital pH Meter works by detecting the activity of hydrogen ions in a liquid sample.

When the glass electrode is immersed in the solution, a small electrical potential develops across the electrode according to the hydrogen-ion concentration of the liquid. The internal electronic circuit receives this signal, processes it and converts it into a pH reading.

The pH reading indicates whether the tested liquid is acidic, neutral or alkaline:

• A pH value below 7 indicates an acidic solution
• A pH value around 7 indicates a neutral solution
• A pH value above 7 indicates an alkaline solution

The instrument also senses the liquid temperature and displays it along with the pH value. Both readings appear simultaneously on the high-definition LCD, reducing the need to use separate instruments for basic pH and temperature checking.

For measurement, the user removes the protective cap, switches on the meter and immerses the electrode into the liquid sample. After gently stirring the meter and allowing the reading to stabilise, the pH and temperature values can be observed on the display.

The three-point automatic calibration system uses standard buffer solutions to adjust the instrument against known pH values. Automatic buffer identification simplifies the calibration process and helps maintain measurement reliability.

C. Why Is the Metravi PH-700 Used?

The Metravi PH-700 is used because pH is an important water-quality and process-control parameter. Incorrect pH can affect water taste, chemical effectiveness, plant growth, aquatic health, manufacturing quality and the performance of water-treatment systems.

The meter helps users obtain a numerical pH reading without depending on colour-comparison strips or manual chemical test kits. Digital measurement makes it easier to monitor gradual changes and compare results over time.

The PH-700 can be used for:

• Checking the pH of drinking water
• Monitoring aquarium and fish-tank water
• Testing swimming-pool and spa water
• Checking hydroponic nutrient solutions
• Monitoring reverse-osmosis water
• Testing water used in food and beverage applications
• Checking water used in hydrotherapy systems
• Performing basic laboratory liquid testing
• Conducting routine water-treatment inspections
• Monitoring agricultural and horticultural solutions
• Checking process-water conditions
• Comparing untreated and treated water samples

Regular pH monitoring helps users determine whether corrective treatment, chemical dosing, filtration adjustment or further laboratory analysis may be required.

D. Suitable Buyers

The Metravi PH-700 Digital pH Meter is suitable for:

• Water-treatment professionals
• Drinking-water testing service providers
• Swimming-pool maintenance companies
• Aquarium owners and aquarium service providers
• Hydroponic growers
• Agricultural professionals
• Horticulture and nursery operators
• Reverse-osmosis system technicians
• Water-purifier service engineers
• Food and beverage manufacturers
• Quality-control departments
• Educational institutions
• Science laboratories
• Environmental-testing professionals
• Hotels, resorts and spas
• Facility-management companies
• Industrial maintenance departments
• Water-testing equipment dealers
• Home users requiring routine water-quality checks
• Research and development laboratories

Frequently Asked Questions

1. What does the Metravi PH-700 measure?

The PH-700 measures the pH value and temperature of a liquid sample. Both readings are displayed simultaneously on its digital LCD.

2. What is the pH measurement range?

The meter has a pH measurement range of 0.00 to 14.00.

3. What is the resolution of the PH-700?

The instrument has a resolution of 0.01 pH, allowing users to observe small differences in pH readings.

4. What is the specified pH accuracy?

The catalogue specifies an accuracy within 0.05 pH under appropriate operating and calibration conditions.

5. Does the Metravi PH-700 measure temperature?

Yes. It measures temperature from 0 to 60 degrees Celsius, corresponding to 32 to 140 degrees Fahrenheit.

6. Can it display pH and temperature together?

Yes. The high-definition LCD displays the pH value and temperature simultaneously.

7. Does the PH-700 require calibration?

Yes. Periodic calibration is recommended to maintain reliable measurements, particularly before important tests or after prolonged storage.

8. How many calibration points does it support?

The Metravi PH-700 supports three-point automatic calibration with automatic buffer identification.

9. Are calibration buffers included?

The catalogue states that three buffer powders are included in the package.

10. Does the meter have a replaceable electrode?

Yes. The PH-700 has a detachable glass electrode that can be replaced when necessary.

11. Is the PH-700 suitable for drinking-water testing?

Yes. It can be used to check the pH and temperature of drinking water. However, pH measurement alone does not confirm that water is completely safe for consumption.

12. Can it be used for aquariums?

Yes. It is suitable for aquarium and fish-tank water testing. Maintaining the correct pH is important because different aquatic species require different water conditions.

13. Is it suitable for hydroponics?

Yes. The PH-700 can be used to check hydroponic nutrient solutions and help growers maintain an appropriate pH range for nutrient availability.

14. Can it test swimming-pool water?

Yes. It can measure the pH of swimming-pool and spa water. The result can help determine whether chemical adjustment may be required.

15. Can it be used for reverse-osmosis water?

Yes. The meter is suitable for checking the pH of water from reverse-osmosis systems and other water-purification equipment.

16. Is the Metravi PH-700 a laboratory pH meter?

It can be used for portable and routine laboratory measurements. For advanced analytical work requiring traceable calibration, data logging or specialised electrodes, a laboratory-grade benchtop instrument may be more appropriate.

17. How is a pH measurement taken?

Remove the protective cap, switch on the meter, rinse the electrode, immerse it in the sample and wait for the reading to stabilise. Rinse the electrode after testing to reduce contamination between samples.

18. Why should the electrode be rinsed between tests?

Rinsing prevents residue from one sample from contaminating another sample and affecting the next reading.

19. Should the electrode be allowed to dry out?

Glass pH electrodes should generally be stored according to the manufacturer’s instructions and should not be left dry for extended periods. Proper storage helps maintain response speed and measurement stability.

20. What type of batteries does the PH-700 use?

The instrument operates using four 1.5 V LR44 button cells.

21. Is the meter portable?

Yes. It weighs approximately 88 grams and has a slim, pocket-sized design suitable for carrying in a bag, toolkit or pocket.

22. Can a digital pH meter replace laboratory water testing?

The PH-700 provides pH and temperature readings, but it does not measure every water-quality parameter. Complete water analysis may also require testing for conductivity, total dissolved solids, chlorine, hardness, turbidity, microorganisms and other contaminants.