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    Product description

    The HI991301 is designed to measure pH, conductivity (EC), total dissolved solids (TDS), and temperature with a single probe. From setup to calibration all operations are performed with just two buttons. The meter is waterproof and rated for IP 67 conditions.

    The HI1288 pre-amplified multiparameter probe features an easy-to-clean sensor and a cloth junction that can be renewed to increase the life of the probe. To ensure against interference from transient electrical noise, a solid-state amplifier is integrated into the HI1288.

    User-selectable features include different TDS factors from 0.45 to 1.00 and a range of temperature coefficients (β) from 0.0 to 2.4% for greater consistency and reproducibility. Standardized buffer recognition values are also selectable.

    These instruments easily fit in the palm of your hand and the bottom probe connection ensures the electrode cable doesn’t get in your way. The large, multi-level LCD displays the primary reading, temperature, and calibration guides simultaneously.

    • 3-in-1 probe measures pH, EC/TDS, and temperature.
    • Comes with all the necessary solutions and batteries- everything you need to get started measuring right away.
    • Perfect for water quality testing.


    pH Range

    0.00 to 14.00 pH

    pH Resolution

    0.01 pH

    pH Accuracy (@25ºC/77ºF)

    ±0.01 pH

    pH Calibration

    automatic, at one or two points with two sets of standard buffers (pH 4.01 / 7.01 / 10.01 or pH 4.01 / 6.86 / 9.18)

    Conductivity Range

    0.00 to 20.00 mS/cm

    Conductivity Resolution

    0.01 mS/cm

    Conductivity Accuracy (@25ºC/77ºF)

    ±2% F.S.

    TDS Range

    0.00 to 10.00 ppt (g/L)

    TDS Resolution

    0.01 ppt (g/L)

    TDS Accuracy

    ±2% F.S.

    Temperature Range

    0.0 to 60.0°C / 32.0 to 140.0°F

    Temperature Resolution

    0.1°C / 0.1°F

    Temperature Accuracy (@25ºC/77ºF)

    ±0.5°C /±1°F

    Temperature Compensation

    pH: automatic; EC/TDS: automatic with β adjustable from 0.0 to 2.4% / °C

    EC/TDS Calibration

    automatic, one-point at: 6.44 ppt (CONV=0.5), 9.02 ppt (CONV=0.7), or 12880 µS/cm

    TDS Conversion Factor

    0.45 to 1.00


    HI1288 PVC body, pre-amplified multiparameter probe with internal temperature sensor, DIN connector and 1m cable

    Battery Type/Life

    1.5V (3) AAA / approximately 500 hours of continuous use; auto-off after 8 minutes of non-use


    0 to 50°C (32 to 122°F); RH max 100%


    150 x 80 x 36 mm (5.9 x 3.1 x 1.4’’)


    205 g (7.2 oz.)

    Ordering Information

    Each meter is supplied complete with HI 1288 probe, batteries, rugged carrying case and instructions.



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    HI991301 Water-resistant pH / EC / TDS and temperature Multiparameter
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    HI991301 Water-resistant pH / EC / TDS and temperature Multiparameter
    0 In stock: Delivery time on request
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