Clear Probe Status Indication

Ensure your soil pH electrode is functioning correctly with the intuitive on-screen indicator, providing confidence in every measurement you take.

Long-Lasting Battery Performance

Power your field testing for up to 1400 hours with the included robust batteries. A low battery alert will appear when levels drop, and the meter will automatically shut down to prevent inaccurate readings due to low power.

Customizable Power Management

Extend battery life and enhance safety with the adjustable automatic shut-off feature, offering settings for 8 or 60 minutes of inactivity, or the option to disable it for continuous monitoring.

Durable for Field Applications

The HI99121 features a rugged IP67-rated waterproof casing, specifically engineered to withstand the demands of soil testing in various outdoor environments, providing excellent protection against dust and water ingress.

Ergonomic and Simple Operation

Designed for comfortable handheld use, this portable meter features a clear, multi-angle LCD display for easy pH and temperature readings. The straightforward two-button operation ensures ease of use for any operator in the field.

Effortless Probe Connection

The Quick Connect DIN connector allows for fast and secure attachment and removal of the specialized soil pH probe. Its protective rubber boot ensures a reliable, waterproof connection without the need for twisting, enhancing probe longevity and ease of handling.

Dedicated Electrode for Soil Analysis

The HI99121 includes the HI12923 replaceable probe, meticulously engineered for direct and accurate pH measurements in various soil types and prepared soil samples.

Open Junction Design Prevents Clogging

The electrode's open junction reference design minimizes the build-up of organic matter and particulates common in soil, ensuring more stable and dependable pH readings with less frequent cleaning.

Durable Conical Glass Tip

The robust conical tip is specifically shaped for direct insertion into soil, semi-solids, and emulsions, allowing for reliable pH measurements in a wide range of agricultural substrates.

Easy-to-Clean Glass Body with Temperature Sensor

The glass body is chemically resistant and easy to clean, ensuring rapid thermal equilibrium for faster, more stable measurements. An integrated temperature sensor provides quick and accurate temperature compensation, even with fluctuating conditions.

Specialized Electrode Cleaning Solutions

The kit includes dedicated cleaning solutions for both soil and humus deposits, specifically formulated to keep your electrode free from common contaminants, ensuring optimal performance and longevity.

Reliable pH Calibration Buffers

Ensure accurate calibrations with the provided starter sachets of pH 4 and pH 7 buffer solutions. These single-use sachets guarantee fresh, uncontaminated standards for dependable calibration every time you need it.

Soil Preparation Solution for Accuracy

The included HI7051M soil preparation solution helps to condition soil samples, leading to more accurate and consistent pH readings.

Practical Ground Auger Included

A durable plastic auger is provided to easily perforate and loosen soil, preventing damage to the sensitive pH electrode during direct measurement in the field.

Original HI99121 (Left)

• Uses the HI1292D pH probe with DIN Connector
• Compatible with the HI710023 Shockproof Boot

New HI99121 (Right)

• Uses the HI12923 pH probe with Quick DIN Connector
• Compatible with the HI710028 Shockproof Boot

*Note: The new Quick DIN probe connection is compatible with the old body design; however, the old DIN probe connections are not compatible with the new body design.