All Categories
    Menu Close

    4 in 1 Digital pH Meter, TDS/Ph/Conductivity/Salinity

    This is a multifunctional 4-in-1 digital pH meter designed to accurately measure pH, total dissolved solids (TDS), conductivity, and salinity levels in various liquids. It is ideal for a wide range of applications, from laboratory use to home gardening and aquarium maintenance.
    i h
    🚚 Free shipping
    🔙 30-day returns
    📅 Delivery: 7-12 days

    This is a portable 4-in-1 digital pH meter that combines versatility, accuracy, and convenience. It is an indispensable tool for professionals and enthusiasts in fields such as agriculture, hydroponics, aquaculture, and water treatment.

    Waterproof digital pH meter

    Multi-Functional Testing Modes

    • IP67 protection rating ensures the pH meter is protected against dust ingress and immersion in water up to a certain depth, making it suitable for use in various environments.
    • Versatile handled pH Meter with multi-functional testing modes, easily switch between TDS, conductivity, salinity, and 
      measurement with the press of a button.
    • Utilizing NTC material, the external temperature sensor enhances response time and accuracy, guaranteeing a measurement precision of up to 0.1°C. 
    Digital pH meter details

    Efficient Power and Durability

    • Powered by 7 AAA Alkaline batteries delivers sufficient power for prolonged operation, while the use of widely available AAA batteries ensures easy replacement and minimal downtime.
    • Replaceable U-shaped glass electrode head for direct measurement without the need for soaking.
    • Built to withstand the rigors of regular use, ensuring longevity and reliability in demanding laboratory or field settings.
    • The digital pen type pH tester incorporates a beeping function to signal various states, including powering on, completing calibration, achieving stable readings, and key presses.


    The SISCO digital pH meter is utilized across industries such as aquaculture, leather production, water quality testing, scientific research, environmental water treatment, food brewing, textile manufacturing, and dough preparation for precise pH measurement and control.

    Dough making industry


    Water quality testing industry

    Water Quality Testing

    Fabric industry

    Scientific Research

    Scientific research industry

    Water Treatment

    Model SISCO-PM-DDS10
    Basic Parameters Electrode Sensor Type U-shaped glass electrode
    Calibration Method Automatic, 1408μS/cm (1 point calibration)
    Display Mode Rice digital screen
    Backlight Color Orange
    Sound Switch Yes
    Power Supply (7#) AAA battery x 1PCS
    Weight 650g
    Conductivity Measuring range 0.0μS/cm(ppm)- 20.00mS/cm(ppt)
    Resolution 0.1μS/cm(ppm)-0.01mS/cm(ppt)
    Measurement Accuracy ±1 %F.S
    Temperature Measuring Range 0.0-60°C/ 32-1 40°F
    Resolution 0.1°C
    Compensation Range Automatic, 0-60°C/32-140°F
    Temperature Coefficient 0.00-0.05, default 0.02
    Reference Temperature Range 10-40°C (default 25°C)
    Measurement Accuracy ±1%F.S
    Temperature Sensor Structure External
    TDS Measuring Range 0-20.00ppt
    TDS Coefficient 0.01-1.0 adjustable (default 0.55)
    Measurement Accuracy ±1 %F.S
    Salinity Measuring Range 0-16.00ppt
    Salinity Coefficient NACL 0.65
    Measurement Accuracy ±1%F.S



    Digital pH meter structure


    Q1: How to replace the electrode head of the SISCO digital pH meter?
    A1: Replacing the electrode head of the SISCOdigital pH meter typically involves a few simple steps:

    1. Pull off the electrode cap directly, do not rotate to avoid damaging the electrode sensor.
    2. Unscrew the electrode fixing ring counterclockwise.
      Pull out the electrode head, do not rotate to avoid damaging the circuit.
    3. Align the two electrode grooves and push the electrode head into the main unit.
    4. Tighten the electrode fixing ring by rotating it clockwise.
      Put on the electrode cap, do not rotate to avoid damaging the electrode sensor.

    Q2: How to calibrate the SISCO digital pH meter?
    A2: Calibrating a digital pH meter like the SISCO model typically involves a few steps. Here's a general guide:

    1. Calibration is required for first-time use, battery replacement, and electrode replacement to ensure the accuracy of the 
      test. It is recommended to calibrate the meter every 2-4 weeks for optimal accuracy.
    2. Buffer solutions should be stored away from light and at low temperatures. Do not reuse buffer solutions, and discontinue use if there are any precipitates or spots in the buffer solution.
    3. Rinsing the electrode sensor before immersing it into the next buffer solution each time can improve calibration and testing accuracy.

    Q3: How to replace the digital pH meter battery?
    A3: Replacing the battery in a digital pH meter typically involves the following steps:

    1. Turn counterclockwise to remove the top cover.
    2. Push open the battery compartment cover.
    3. Remove the old battery and insert the new one (recommended to use 7# AAA alkaline dry battery).
    4. Close the battery compartment cover.
    5. Turn clockwise to tighten the top cover.

    Tips: What are the applications of a 4 in 1 Digital pH Meter?

    A 4 in 1 Digital pH Meter typically combines pH measurement with additional functionalities, such as measuring conductivity, temperature, and sometimes total dissolved solids (TDS). Here are some common applications for such a versatile device:

    • Aquariums and Fish Tanks: pH measurement is crucial for maintaining the health of aquatic organisms. Additionally, monitoring conductivity and temperature can help ensure optimal water conditions for fish and other aquatic life.
    • Hydroponics and Aquaponics: pH levels play a critical role in nutrient uptake by plants in hydroponic and aquaponic systems. Conductivity measurement can also help in monitoring nutrient levels, while temperature monitoring ensures the environment remains conducive to plant growth.
    • Swimming Pools and Spas: Maintaining the proper pH balance in swimming pools and spas is essential for water quality and the effectiveness of sanitizers. Monitoring temperature and conductivity can also help ensure a comfortable and safe swimming environment.
    • Laboratory and Industrial Applications: pH measurement is fundamental in various laboratory and industrial processes, such as water quality analysis, chemical manufacturing, and food processing. Conductivity measurement may also be relevant in assessing the purity of water or the concentration of dissolved substances.
    • Agriculture: pH measurement is critical in soil analysis for agriculture. Monitoring soil pH helps in determining the suitability of soil for specific crops and in adjusting soil amendments for optimal plant growth. Conductivity measurement can also provide insights into soil fertility.
    • Beverage Production: pH measurement is essential in the production of beverages like wine, beer, and soft drinks to ensure product quality and consistency. Temperature monitoring can help control fermentation processes, while conductivity measurement may be relevant for assessing water quality or the concentration of dissolved substances.
    • Educational and Research Purposes: Digital pH meters with multiple functionalities are valuable tools in educational settings for teaching about pH, conductivity, and related concepts in chemistry, biology, and environmental science. They are also useful for conducting research experiments.

    Thank you for buying industrial test and measurement equipment on, all products sold by SISCO and the partner cover a 12 months warranty, effective from the date of receiving the products.

    What is covered?

    SISCO is responsible for providing free spare parts, and free technical support to assist the customer to repair the defective products until the problem is solved.

    What is not covered?

    • Product purchased from anyone other than a SISCO store or a SISCO authorized reseller.
    • Expendable parts.
    • Routine cleaning or normal cosmetic and mechanical wear.
    • Damage from misuse, abuse or neglect.
    • Damage from use of parts other than SISCO approved.
    • Damage from use outside the product’s usage or storage parameters.
    • Damage from use of parts not sold by SISCO.
    • Damage from modification or incorporation into other products.
    • Damage from repair or replacement of warranted parts by a service provider other than a SISCO authorized service provider.
    • Damage caused by the application environment not meeting the product usage requirements and the failure to perform preventive maintenance.
    5.0 1
    Write your own review Close
    Phaddeas | 5/16/2024 12:38 AM
    A Must-Have Digital pH Meter for Reliable Water Testing
    I am thoroughly impressed with this 4-in-1 digital pH meter! It offers precise and reliable measurements for pH, TDS, conductivity, and salinity. The calibration process is straightforward, and the readings are consistent and accurate. The backlit display is clear and easy to read, even in low-light conditions.