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    อุปกรณ์วัด Multiparameter (pH & TDS Continuous Indicator)

    HI 981404N-01

    pH & TDS Continuous Indicator

    HI 981404N-01 is ideal for agricultural, horticultural and hydroponics applications where pH and TDS levels need to be continuously monitored for optimal plant growth. This instrument continuously monitors and displays the values of a solution on an easy to read set of LCD’s.

    The HI 1286 gel filled pH electrode is replaceable and the BNC connector is protected behind a waterproof sleeve. The unique design of the electrode guarantees greater clogging resistance in fertilizer solutions with high concentrations of phosphate, nitrate, etc. TDS measurements are performed using the 4-4-2 conversion factor of 0.7 so you do not need to convert the readings.

    This model is equipped with a grounding bar to ensure highly accurate pH readings and longer electrode life.

    The HI 981404N-01 is compact and easy to install and use making it ideal for all continuous monitoring applications.


    Range pH 0.0 to 14.0 pH
    TDS 0 to 1990 mg/L (ppm)
    Resolution pH 0.1 pH
    TDS 10 mg/L (ppm)
    Accuracy @ 20°C pH ±0.2 pH
    TDS ±2% F.S.
    Calibration pH manual at one or two points
    TDS manual at one point
    Compensation  automatic from 5 to 50°C (41 to 122°F) (TDS only)
    TDS Conversion Factor  0.7 ppm = 1 µS/cm
    Probes  HI 1286 interchangeable pH electrode (included), HI 7634 TDS probe (fixed), HI 1283 grounding bar with 2 m (6.6’) cable (included)
    Power Supply  12 VDC adapter (included)
    Environment  0 to 50°C (32 to 122°F), RH 95%
    Dimensions  165 x 110 x 35 mm (6.5 x 4.3 x 1.3”)
    Weight  300 g (10.6 oz.)


    HI 1286  Spare pH Electrode for pH Indicators
    HI 70000P  Rinsing Solution 25 x 20 mL sachets
    HI 70004P  4.01 pH Buffer Solution, (25) 20 mL
    HI 70007P  7.01 pH Buffer Solution
    (25) 20 mL sachets
    HI 70442P  1500 mg/L (ppm) TDS Solution, (25) 20 mL Sachets
    HI 70039P  5000 µS/cm EC Solution (25) 20 mL Sachets
    HI 70300M  Electrode Storage Solution
    1 x 230 mL bottle
    HI 7061M  General Purpose Cleaning Solution
    1 x 230 mL bottle
    HI 710005  Power Adapter, 115 Vac to 12 VDC, US Plug
    HI 710006  Power Adapter, 230 Vac to 12 VDC, European Plug


  • Requesting a Quotation and Ordering Products

    131 Thailand Science Park. Innovation Cluster 1 Building,

    Klong 1, Klong Luang, Pathumthani 12120 Thailand. 

    Tel.  02-191-3928 Fax 02-191-3929

    For more information please contact 081-847-6768 (Ms. Nareerat) IDLine: @alltestkit

    E-mail :


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