Hanna Instruments pH/ORP/Temperature Combo Tester - HI98121

The HI98121 is a reliable, waterproof tester designed for quick, accurate pH and ORP measurements in one convenient handheld device. With 0.01 pH resolution, ±0.05 pH and ±2 mV accuracy, this compact meter features automatic two-point calibration, built-in temperature compensation, and a replaceable pH electrode — eliminating the need to switch between meters for routine testing.

• Simultaneously measures pH and ORP
• ±0.05 pH / ±2 mV accuracy
• Replaceable pH electrode extends product life
• Floats and is waterproof for field use

Ideal for: Pools, food sanitization, plating processes, wastewater, and industrial water treatment applications.

*Products classified as Dangerous Goods can only be shipped via ground.

Key Features:

Dual Measurement Capability
Monitor both pH and ORP simultaneously with one compact tester. This makes it perfect for chlorine monitoring, redox potential testing, and general water quality checks in a wide variety of environments.

Replaceable pH Electrode
Equipped with a replaceable pH sensor cartridge, the HI98121 offers extended product lifespan and reduced maintenance costs. The durable snap-in connector design eliminates fragile pins and ensures secure installation.

Accurate & Stable Readings
With 0.01 pH resolution and high sensitivity ORP measurement, this meter provides fast, reliable data — backed by automatic temperature compensation for increased accuracy.

Understanding ORP:

ORP (Oxidation-Reduction Potential) measures a solution's ability to oxidize or reduce chemical species. While pH measures the activity of hydrogen ions, ORP reflects the total redox activity of a solution. ORP sensors must be chemically stable and made of inert materials such as pure platinum or gold to support rapid electron exchange.

Smart Design & Functionality:

• Waterproof Housing: Designed to float and function in wet environments
• Automatic Temperature