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Hanna Instruments – HI98129 Combo pH/Conductivity/TDS Tester (Low Range)

The HI98129 Combo Tester from Hanna Instruments is a compact, waterproof multiparameter tester designed to measure pH, Electrical Conductivity (EC), TDS, and temperature in one portable device. With high precision 0.01 pH resolution and ± 0.05 pH accuracy, low-range EC (0–3999 µS/cm), and TDS (0–2000 ppm) measurement capability, it eliminates the need for multiple meters. Featuring automatic calibration, adjustable EC to TDS conversion factors, and a replaceable pH electrode, the HI98129 is ideal for water quality monitoring, hydroponics, and environmental testing.

  • 4-in-1 Waterproof Floating Tester

  • High Accuracy: ± 0.05 pH with 0.01 Resolution

  • Replaceable pH Electrode with Extractable Junction

  • Selectable EC to TDS Conversion Factor (0.45 to 1.00)

Description

The HI98129 is engineered for users who require precise and reliable low-range conductivity and high-accuracy pH measurements in a single handheld device. It measures pH from 0.00 to 14.00, EC from 0 to 3999 µS/cm, TDS from 0 to 2000 ppm, and temperature from 0.0 to 60.0°C, all with automatic temperature compensation. With 0.01 pH resolution and ± 0.05 pH accuracy, it delivers superior performance compared to standard pocket testers. The automatic one- or two-point pH calibration and one-point EC/TDS calibration simplify setup and ensure consistent results.

Designed for durability and ease of use, the tester features a waterproof casing that floats if dropped in water. The integrated graphite EC sensor minimizes polarization effects and resists oxidation, improving measurement stability. A large LCD displays calibration tags, stability indicators, and low battery warnings, while the HOLD function allows convenient data recording. The replaceable HI73127 pH electrode with extractable junction extends electrode life, and the adjustable EC to TDS conversion factor (0.45–1.00) provides flexibility for different water quality applications.

Features

  • 4-in-1 Multiparameter Design – Integrated pH electrode, amperometric EC/TDS sensor, and temperature probe in one meter.
  • High-Precision pH Measurement – 0.00 to 14.00 pH range with 0.01 resolution and ±0.05 accuracy.
  • Waterproof & Floating Casing – Designed to float if accidentally dropped in water.
  • Replaceable HI73127 pH Electrode – Includes extractable junction for extended electrode life.
  • Adjustable EC to TDS Conversion Factor – Selectable from 0.45 to 1.00 for application flexibility.
  • Graphite EC Sensor – Minimizes polarization effects and prevents oxidation.
  • Automatic Temperature Compensation (ATC) – Displays temperature in °C or °F.
  • Large LCD Display – Shows stability indicator, calibration tags, and low battery indicator.
  • Battery Error Prevention System (BEPS) – Prevents inaccurate readings due to low battery.
  • Automatic Shut-Off – Three user-controlled settings to conserve battery life.

Specifications

SKU HI98129
Product Name Combo pH/Conductivity/TDS Tester (Low Range) – HI98129
Quote Required Yes
pH Range 0.00 to 14.00 pH
pH Resolution 0.01 pH
pH Accuracy ±0.05 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)
pH Temperature Compensation automatic
EC Range 0 to 3999 µS/cm
EC Resolution 1 µS/cm
EC Accuracy ±2% F.S.
EC Calibration automatic, one-point at
TDS Range 0 to 2000 ppm (mg/L)
TDS Resolution 1 ppm (mg/L)
TDS Accuracy ±2% F.S.
TDS Calibration automatic, one-point at
EC/TDS Temperature Compensation automatic with β adjustable from 0.0 to 2.4% / °C
EC to TDS Conversion Factor 0.45 to 1.00
Temperature Range 0.0 to 60.0°C / 32.0 to 140.0°F
Temperature Resolution 0.1°C / 0.1°F
Temperature Accuracy ±0.5°C /±1°F
pH Electrode HI73127 (replaceable; included)
Battery Type/Life 1.5V (4) / approx. 100 hours of continuous use, auto-off after 8 minutes of non-use
Environment 0 to 50°C (32 to 122°F); RH max 100%
Dimensions 163 x 40 x 26 mm (6.4 x 1.6 x 1.0’’)
Weight 100 g (3.5 oz.)
Ordering Information HI98129 is supplied with HI73127 pH electrode and HI73128 electrode removal tool, batteries (4 x 1.5V) and instructions.

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