HI 991301 Multiparameter pH/EC/TDS/°C - EC to 20.00 mS

Manufacturer: HANNA Instruments Inc.

Order number: HI991301

Availability:         5 pcs. in stock

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Delivery time appr. 1-3 workdays

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Product information "HI 991301 Multiparameter pH/EC/TDS/°C - EC to 20.00 mS"

HI 991301 has been designed to offer you  pH, conductivity, total dissolved solids and temperature measurements all in a slim, lightweight, portable unit. From purified to brine water measurement, you can select the meter which will work best with your range of conductivity for greater precision.

There are only 2 buttons, yet you can select from a range of calibration buffers and even the temperature scale (°C or °F) most familiar to you. The housing is waterproof and rated for IP 67 conditions.

The HI 1288 pre-amplified multiparameter probe features an easy to clean sensor and a cloth junction that can be pulled longer to increase the life of the probe. To ensure against interference from transient electrical noise, a solid-state amplifier is integrated into the HI 1288.

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.

This instrument easily fits 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.


  • Automatic one or two point calibration
  • Multi-level LCD display; The meters display the current measurement simultaneously with the current temperature.
  • On-screen tutorial messages for calibration and setup
  • HOLD; The HOLD button freezes readings on the display for manual recording
  • Automatic Temperature Compensation
  • BEPS (Battery Error Prevention System) alerts the user in the event that low battery power could adversely affect readings
  • Measure pH, EC/TDS and temperature with one probe
  • Battery % displayed on startup
  • Easy to clean and keep clean


Order Information:   HI 991301 is supplied with HI 1288 multiparameter probe, HI 70004 pH 4.01 buffet sachet, HI 70007 pH 7.01 buffer sachet, HI 70030 12880 µS/cm calibration solution sachet, HI 70038 6.44 g/L (ppt) calibration solution sachet, HI 700661 electrode cleaning solution sachet, batteries, instructions and rugged carrying case.

Product Manuals

  Manual: Download

Specification :

Range pH 0.00 to 14.00 pH
  EC 0.00 to 20.00 mS/cm
  TDS 0.00 to 10.00 ppt (g/L)
  Temperature 0.0 to 60.0°C (32.0 to 140.0°F)
Resolution pH 0.01 pH
  EC 0.01 mS/cm
  TDS 0.01 ppt
  Temperature 0.1°C (0.1°F)
Accuracy pH ±0.01 pH
  EC ±2% F.S.
  TDS ±2% F.S.
  Temperature ±0.5°C (±1.0°F)
TDS Conversion Factor   selectable 0.45 to 1.00 with 0.01 increments (default 0.50)
pH Calibration   automatic, one or two point calibration with two sets of memorized buffers (Standard 4.01, 7.01, 10.01 or NIST 4.01, 6.86, 9.18)
EC/TDS Calibration   automatic, 1 point at 6.44 ppt (CONV 0.5) at 9.02 ppt (CONV 0.7) at 12880 µS/cm (others)
Temperature Compensation pH Automatic
  EC/TDS Automatic with selectable ß from 0.0 to 2.4%/°C with 0.1 increments
Probe   HI 1288 PVC body, pre-amplified multiparameter probe with internal temperature sensor, DIN connector and 1.2 m (3.93’) cable (included)
Battery Type / Life   1.5V AAA (3) /approximately 500 hours of continuous use. auto-off after 8 minutes of inactivity
Environment   0 to 50°C (32 to 122°F); RH max 100%
Dimensions   152 x 58 x 30 mm (6.0 x 2.3 x 1.2”)
Weight   205 g (7.2 oz.)

Click on the links below to download the Safety Data Sheet.


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