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    pH / EC / TDS Meter (Low Range)

pH / EC / TDS Meter (Low Range)

Portable & Waterproof

  • 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.

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The specialized electrode combines 3 sensors in a single rugged probe body featuring a polypropylene body, integrated temperature sensor, and cloth junction


Designed to bring simplicity to environmental testing, the HI991300 pH/EC/TDS Meter is designed specifically for use in manufacturing and environmental testing protocols. 

It is lightweight, compact and waterproof, ideal for routine field inspections. Equipped with a 2-level display, HI991300 simultaneously displays pH or conductivity (or TDS) and temperature. Supplied with a solid multiparameter probe with excellent resistance to aggressive media, it allows the user to measure each parameter successively, without the inconveniences of an in-between calibration or probe replacement.

Calibration is performed at the touch of a button to access pre-recorded pH and conductivity buffer solution values. Accuracy is ensured by automatic temperature compensation and the probe developed to completely eliminate the polarization and oxidation problems frequently encountered during multiparameter measurements. The user has the possibility to select the temperature coefficient or the TDS (Total Dissolved Solids) ratio adapted to his application.


HI991300 is supplied in a carrying case with a pH/EC/TDS/°C probe HI12883, pH 4.01 (20 mL) and pH 7.01 (20 mL) buffer solution, 1413 µS/cm (20 mL) calibration solution, 1382 mg/L (20 mL) calibration solution, electrode cleaning solution (2 x 20 mL),100 mL beaker and batteries.


The main strengths

  • Waterproof and compact housing is easy to clean
  • 4 measuring devices in 1
  • Simultaneous display of pH, conductivity (or TDS) and temperature
  • Ready-to-measure kit delivered in a robust carrying case
  • Keyboard calibration, easy to perform
  • Robust multiparameter pH/EC/TDS/°C probe
  • Automatic correction of temperature measurements
  • Adjustable temperature coefficient and TDS factor
  • Low battery charge warning indicator
  • Designed to simplify environmental testing, the HI991300 pH/EC/TDS meter is specially designed for use in manufacturing and environmental testing protocols. 


Probe Condition

An on-screen indicator provides visual confirmation that your probe is working at its best.

Low Battery Indicator

The included batteries provide 1400 hours of continuous use. When the battery level is below 10%, a warning symbol will blink to indicate low battery condition. When low battery power may affect your results, the meter will shut down to avoid erroneous readings caused by low battery level.

Automatic Shut-off The auto-off

feature can be set to shut the meter off at 8 or 60 minutes, or it can be disabled so that the meter continuously stays on. The auto-off feature prolongs battery life for peace-of-mind and energy savings if the meter is accidentally left on.




Built to be Durable

Designed to withstand the knocks, drops, and spills of real life, the new IP67 body ensures top performance in any environment. These meters are protected against dust and water intrusion from any direction.

Portable Design

Made to fit comfortably in your hand for on-the-go testing, the multilevel LCD display provides at-a-glance readings of pH and temperature from any angle and dual button operation streamlines the testing process for any user.

Quick Connect Probe

A Quick Connect DIN connector makes attaching and removing the probe simple and easy. The rubber coating protects the cable and provides a water-tight seal without twisting.



Your measurements require detailed attention; so should your electrode. The HI991300 pH/EC/TDS Meter features a replaceable HI12883 probe that has been carefully designed specifically for pH measurements encountered in manufacturing and environmental testing protocols.




Polypropylene Body

The polypropylene body of the HI12883 houses all three sensors within a sturdy, single body design. The plastic body protects the electrode from damage, is easy to clean, and is chemically resistant to many aggressive chemicals.



Pre-Amplified pH Electrode

The pH sensor in the probe is a single junction electrode with gelled electrolyte and a retractable cloth junction. When readings appear sluggish, simply pull out some of the cloth material from out from its position t renew the junction with an uncontaminated, fresh surface.



Amperometric EC/TDS Sensor

The EC/TDS portion is a two-ring probe that comes with the HI991300, offering an accurate solution for low range EC and TDS readings. An integrated temperature probe ensures fast, accurately compensated readings even during sudden temperature fluctuations.





We believe that buying a meter should be simple. Your Portable pH/EC/TDS Meter is equipped with everything you need for successful testing right out of the box.

General Electrode Cleaning Solution

Your Portable pH/EC/TDS Meter comes with cleaning solution that has been engineered to keep your electrode free from debris and build up. This concentrated combination of detergents cleans your meter quickly and effectively so that your meter stays in optimum condition.

pH 4 & 7 Buffer Sachets

When performing a pH calibration it is important that the correct buffers are used. We include some start buffers to get you going. The single-use sachets are individually sealed so you use fresh buffer each time you calibrate.

1413 μS/cm and 1382 ppm Conductivity Standard (1 each)

When performing an EC/TDS calibration it is important that the correct standards are used. We include some starter standards to get you going. The single-use sachets are individually sealed so you use fresh buffer each time you calibrate.  


HI991300 Models and Compatible Accessories

Old HI991300 (Left)

  • Uses the HI1288D pH probe with DIN Connector
  • Compatible with the HI710023 Shockproof Boot

New HI991300 (Right)

  • Uses the HI12883 pH probe with Quick DIN Connector
  • Compatible with the HI710028 Shockproof Boot
pH Range-2.0 to 16.0 pH
pH Resolution0.01 pH
pH Accuracy (@25ºC/77ºF)±0.01 pH
pH Calibrationautomatic, 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)
pH-mV Range±825 mV (pH-mV)
pH-mV Resolution1 mV
pH-mV Accuracy±1 mV
Conductivity Range0 to 3999 µS/cm
Conductivity Resolution1 µS/cm
Conductivity Accuracy (@25ºC/77ºF)±2% F.S.
TDS Range0 to 2000 ppm (mg/L)
TDS Resolution1 ppm (mg/L)
TDS Accuracy±2% F.S.
Temperature Range-5.0 to 105.0°C / 23.0 to 221.0°F
Temperature Resolution0.1°C / 0.1°F
Temperature Accuracy (@25ºC/77ºF)±0.5°C /±1°F
Temperature CompensationpH: automatic; EC/TDS: automatic with β adjustable from 0.0 to 2.4% / °C
EC/TDS Calibrationautomatic, one-point at: 1382 ppm (CONV=0.5),1500 ppm(CONV=0.7),1413 µS/cm
TDS Conversion Factor0.45 to 1.00
Electrode/ProbeHI12883 pH/EC/TDS probe with built‑in temperature sensor, DIN connector and 1m (3.3’) cable
Battery Type / Life1.5V AAA (3 pcs.)/ approx. 600 hours of continuous use
Auto-off8 min (default),60 min or OFF
Environment0 to 50°C (32 to 122°F); RH max 100%
Dimensions154 x 63 x 30 mm (6.1 x 2.5 x 1.2”)
Weight196 g (6.91 oz.)
Ordering InformationEach meter is supplied complete with: • HI12883 pH/EC/TDS probe with built‑in temperature sensor, DIN connector and 1m (3.3’) cable • pH 4.01 & 7.01 Buffer sachet • HI70031 1413 μS/cm and HI70032 1382 ppm 1 sachet each for HI991300 • HI700601 Electrode cleaning solution (2 sachets) • 100 mL beaker (1 pcs.) • Alkaline batteries: 1.5V AAA (3 pcs.) • Rugged carrying case • Calibration certificate of meter • Calibration certificate of probe • Instruction manual
Warranty2 years (probe 6 months)