Hanna Instruments HI98129 Combo pH/Conductivity/TDS Tester | Low Range | 0–14.00 pH | 0–3999 µS/cm EC | 0–2000 ppm TDS | Waterproof

The Hanna Instruments HI98129 DiST® Combo Tester is a compact, waterproof multiparameter meter designed to measure pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), and temperature using a single handheld instrument. It is ideal for users who need quick and reliable water-quality measurements without carrying separate meters for each parameter.

With a pH range of 0.00 to 14.00, low-range EC measurement up to 3999 µS/cm, and TDS measurement up to 2000 ppm, the HI98129 is well suited for routine testing in laboratories, water treatment, agriculture, hydroponics, environmental monitoring and general water-quality applications.

Key Features

• 3-in-1 measurement: pH, EC/TDS and temperature
• Wide pH range: 0.00 to 14.00 pH
• Low-range EC: 0 to 3999 µS/cm
• TDS range: 0 to 2000 ppm (mg/L)
• Automatic Temperature Compensation (ATC) for pH, EC and TDS
• Replaceable pH electrode with extractable cloth junction
• Graphite EC/TDS sensor for reliable measurements
• Exposed temperature sensor for faster temperature response
• Automatic calibration
• Selectable EC-to-TDS conversion factor: 0.45 to 1.00
• Adjustable temperature compensation coefficient: 0.0 to 2.4%/°C
• Waterproof and floating design
• Large, easy-to-read LCD
• HOLD function to freeze readings on the display
• Stability indicator shows when readings have stabilized
• Low-battery indicator
• Battery Error Prevention System (BEPS)
• Automatic shut-off after 8 minutes of inactivity

Technical Specifications

Replaceable pH Electrode

One of the major advantages of the HI98129 is its replaceable HI73127 pH electrode. The electrode features an extendable cloth junction that can help extend electrode life. When the pH electrode eventually reaches the end of its useful life, it can be replaced rather than replacing the complete meter. The snap-in connection also makes electrode replacement straightforward.

Graphite EC/TDS Sensor

The integrated graphite conductivity sensor provides reliable EC and TDS measurements and is designed to resist contamination from salt deposits. The exposed temperature sensor provides a fast response and supports automatic temperature-compensated measurements.

Automatic Temperature Compensation

Temperature can significantly affect pH, conductivity and TDS measurements. The HI98129 automatically compensates measurements for temperature changes, while the temperature can be displayed in either °C or °F. For EC/TDS measurements, the temperature compensation coefficient can be adjusted according to the application.

Easy Calibration

The HI98129 provides automatic calibration for both pH and EC/TDS:

pH Calibration:
Automatic one- or two-point calibration using standard buffer solutions such as pH 4.01, 7.01 and 10.01.

EC Calibration:
Automatic one-point calibration at 1413 µS/cm.

TDS Calibration:
Automatic one-point calibration at 1382 ppm.

Applications

The Hanna HI98129 can be used for:

• Drinking water testing
• RO and purified water monitoring
• Water treatment
• Agriculture and irrigation
• Hydroponics
• Aquaculture
• Environmental water testing
• Laboratory applications
• Educational institutions
• Industrial water-quality testing
• General pH, EC and TDS monitoring

Package Contents

The HI98129 package includes:

• HI98129 Combo pH/EC/TDS Tester
• HI73127 replaceable pH electrode
• HI73128 electrode removal tool
• pH 4.01 buffer solution sachet
• pH 7.01 buffer solution sachet
• 1413 µS/cm conductivity standard sachet
• 1382 ppm TDS standard sachet
• pH electrode cleaning solution sachet
• pH electrode storage solution sachet
• Batteries – 4 × 1.5V
• Instrument quality certificate
• Instruction manual

Why Choose Hanna HI98129?

The HI98129 is a practical choice when you need several important water-quality parameters in one portable instrument. Instead of carrying separate pH, EC and TDS meters, this single tester provides pH + EC + TDS + temperature measurement, while its waterproof construction, replaceable pH electrode and automatic calibration make it convenient for regular professional use.