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    อุปกรณ์วัด Multiparameter (pH/EC/TDS/Temperature Monitor low range EC & TDS)

    HI 991404-01

    pH/EC/TDS/Temperature Monitor low range EC & TDS

    This indicator continuously monitors the three most crucial nutrient parameters in hydroponic, greenhouse and horticultural applications.

    At startup, HI 991404-01 performs a self-check to assure proper working condition. The stability indicator and HOLD function lets the user know when to take readings and freezes the reading on display for easy and accurate recording.

    This instrument is supplied with a non-clogging double junction pH electrode as well as a rugged conductivity probe that will withstand even the most aggressive environments. The 12 VDC adapter makes these instruments ideal for all continuous monitoring applications.


    Range pH 0.0 to 14.0 pH
    EC 0 to 3999 µS/cm
    TDS 0 to 2000 mg/L (ppm)
    Temperature 0.0 to 60.0°C / 32.0 to 122.0°F
    Resolution pH 0.1 pH
    EC 1 µS/cm
    TDS 1 mg/L (ppm)
    Temperature 0.1°C (0.1°F)
    Accuracy @ 20°C pH ±0.1 pH
    EC/TDS ±2% F.S.
    Temperature ±0.5°C (±1°F)
    Compensation pH automatic
    EC/TDS automatic with ß adjustable from 0.0 to 2.4%/°C
    Calibration pH automatic, one or two points with auto-buffer recognition
    EC/TDS automatic, one point at 1413 µS/cm or 1382 ppm
    TDS Factor  adjustable from 0.45 to 1.00
    Environment  0 to 50°C (32 to 122°F); RH max 95% non-condensing
    Input Impedance  1012 Ohm
    Power Supply  12 VDC adapter (included)
    Dimensions/Weight  160 x 105 x 31 mm (6.3 x 4.1 x 1.2) / 190 g (6.7 oz.)
    Probes pH HI 1293D PEI body, pre-amplified pH electrode with 1/2” NPT pipe thread, DIN connector and 2 m (6.6’) cable (included);
    EC/TDS HI 7630 conductivity probe with 1/2” NPT pipe thread and 2 m (6.6’) cable(fixed)


    HI 1293D  Spare pH Electrode for pH Monitors
    HI 7630  Conductivity & TDS Probe
    for use with HI 983301, HI 983302, HI 991404 and HI 991405
    HI 70030P  12880 µS/cm EC Solution (25) 20 mL Sachets
    HI 70031P  1413 µS/cm EC Solution, (25) 20 mL Sachets
    HI 70032P  1382 mg/L (ppm) TDS Solution, (25) 20 mL Sachets
    HI 70038P  6.44 g/L (ppt) TDS Solution, (25) 20 mL Sachets
    HI 70442P  1500 mg/L (ppm) TDS 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 70004P  4.01 pH Buffer Solution, (25) 20 mL
    HI 70007P  7.01 pH Buffer Solution
    (25) 20 mL sachets
    HI 70010P  10.01 pH Buffer Solution
    (25) 20 mL sachets

  • 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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