Hanna HI99121 Direct Soil pH Portable Meter – Accurate In-Field Soil pH Measurement
The Hanna HI99121 Direct Soil Measurement pH Portable Meter is a specialized portable pH and temperature meter designed for direct measurement of soil pH without the need for complex sample preparation. Ideal for agronomists, soil scientists, and farmers, this rugged, waterproof device delivers accurate pH and temperature readings directly from the soil or soil slurry.
Supplied with the HI1292D pre-amplified glass-body pH electrode, optimized for soil contact, the HI99121 is easy to calibrate, simple to operate, and highly reliable for precision pH management in crop production, soil conditioning, and land assessment.
Key Features
Specifically Designed for Soil pH Testing
Measures directly in soil or soil slurries
Ideal for agronomy, agriculture, landscaping, and environmental testing
High Accuracy and Resolution
pH Range: –2.00 to 16.00 pH
Resolution: 0.01 pH
Accuracy: ±0.02 pH
Temperature Range: –5.0 to 105.0 °C
Accuracy: ±0.5 °C (≤60 °C)
Specialized Soil Electrode Included
HI1292D pre-amplified pH electrode with:
Glass body designed for soil insertion
Built-in temperature sensor for automatic compensation
Quick-connect DIN connector
1 m (3.3 ft) cable
Automatic Calibration
One or two-point calibration with support for:
Standard buffer set: pH 4.01, 7.01, 10.01
NIST buffer set: pH 4.01, 6.86, 9.18
Automatic Temperature Compensation (ATC)
Ensures precise pH readings across wide temperature ranges typical of outdoor conditions.Compact and Waterproof Design
Lightweight and easy to carry into the field
IP67-rated case for protection against dust and water
Withstands 100% relative humidity
Long Battery Life
Powered by 3 x AAA batteries
Up to 1200 hours of continuous use
Auto shut-off feature to conserve power
Technical Specifications
| Parameter | Details |
|---|---|
| pH Range | –2.00 to 16.00 pH |
| pH Resolution | 0.01 pH |
| pH Accuracy | ±0.02 pH |
| pH Calibration | Automatic, 1 or 2 points with standard or NIST buffers |
| Temperature Range | –5.0 to 105.0 °C (23.0 to 221.0 °F) |
| Temperature Resolution | 0.1 °C / 0.1 °F |
| Temperature Accuracy | ±0.5 °C (≤60 °C), ±1.0 °C (>60 °C) |
| Temperature Compensation | Automatic from –5.0 to 105.0 °C |
| Electrode Included | HI1292D pH electrode for soil, with temp sensor, DIN connector, 1 m cable |
| Battery / Life | 3 x 1.5V AAA / ~1200 hours |
| Auto-Off Function | After 8 minutes of non-use |
| Protection Rating | IP67 waterproof and dustproof |
| Environment | 0 to 50 °C (32 to 122 °F); RH 100% |
| Dimensions / Weight | 152 x 58 x 30 mm / 205 g (7.2 oz) |
Applications
Agriculture & Farming – Optimize crop yields through precise soil pH control
Soil Science & Research – Analyze soil acidity across various terrains and depths
Greenhouses & Nurseries – Maintain optimal pH levels in planting media
Environmental Monitoring – Assess soil quality in reclamation and conservation projects
Landscaping & Turf Management – Fine-tune soil conditions for healthier plant growth
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