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Hanna Instrument – HI99121 Direct Soil Measurement pH Portable Meter

The HI99121 Direct Soil Measurement pH Portable Meter is a compact, rugged, and waterproof (IP67) meterdesigned for fast and accurate soil pH measurement in agricultural and field applications. It includes the HI12923 pre-amplified glass pH electrode with built-in temperature sensor for reliable readings even in low-moisture soils. The meter offers automatic one- or two-point calibration, automatic temperature compensation, and CAL Check™ diagnostics to ensure electrode health. Additionally, the large multi-level LCD displays pH, temperature, calibration status, and battery level for intuitive field operation.

  • Amplified Soil Electrode: HI12923 glass body, pre-amplified, internal temperature sensor, quick-connect DIN
  • Automatic Calibration & Diagnostics: One- or two-point calibration, automatic buffer recognition, probe condition indicator
  • Portable & Rugged: Compact, heavy-duty, waterproof (IP67), battery % displayed at startup
  • Field Ready: BEPS low battery alerts, HELP key messages, and compatible with soil auger and preparation solution

Description

The HI99121 Portable Soil pH Meter provides precise, reliable soil pH measurements, essential for optimizing plant growth. Soil pH strongly influences nutrient availability, microbial activity, and plant health, with most plants preferring a range of 5.5–7.5 pH. The included HI12923 electrode features a pre-amplified glass body and built-in temperature sensor, providing a fast, stable response that is resistant to humidity and electrical noise. Its conical tip design allows direct measurement in soil, and the electrode can be refilled with reference electrolyte to extend its lifetime. The meter automatically compensates for temperature variations, and its CAL Check™ system alerts users to any electrode or buffer issues while displaying the overall probe condition.

Designed for field and agricultural use, the HI99121 is lightweight, ergonomic, and durable, with a large multi-level LCD that shows pH, temperature, calibration status, and battery power. Automatic one- or two-point calibration ensures quick setup, while the BEPS low battery alert prevents inaccurate readings. The meter comes as a complete kit, including buffer solutions, soil preparation solution, cleaning solutions for inorganic and organic soil deposits, a soil auger, a plastic beaker, batteries, instructions, and a hard carrying case, making it ready for immediate soil testing in challenging environments.

Features

  • SKU: HI99121
  • Product Name: Direct Soil Measurement pH Portable Meter – HI99121
  • pH Range: -2.00 to 16.00 pH; -2.0 to 16.0 pH
  • pH Resolution: 0.01 pH; 0.1 pH
  • pH Accuracy: ±0.02 pH; ±0.1 pH
  • pH Calibration: Automatic, one- or two-point; buffers pH 4.01 / 7.01 / 10.01 or 4.01 / 6.86 / 9.18
  • pH Temperature Compensation: Automatic -5.0 to 105.0 °C / 23.0 to 221.0 °F
  • pH CAL Check: Probe condition indicator
  • mV Range: ±825 mV (pH-mV)
  • mV Resolution: 1 mV
  • mV Accuracy: ±1 mV (pH-mV)
  • 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 up to 60°C; ±1.0°C outside / ±1°F up to 140°F; ±2°F outside
  • pH Electrode: HI12923 glass body, pre-amplified, built-in temperature sensor, quick-connect DIN, 1 m cable
  • Automatic Shut-Off: User selectable
  • Battery Type/Life: 1.5V (3) AAA / approx. 1400 hrs continuous use; auto-off after 8 min
  • IP Protection: IP67 waterproof
  • Environment: 0 to 50°C (32 to 122°F), RH max 100%
  • Dimensions: 154 x 63 x 30 mm (6.1 x 2.5 x 1.2”)
  • Weight: 196 g (6.91 oz.)
  • Included Accessories: HI12923 electrode, soil auger (HI721319), soil preparation solution (HI7051M), pH 4.01 & 7.01 buffer sachets, inorganic & organic soil cleaning solutions, 100 mL beaker, batteries, instructions, hard carrying case
  • Features: Refillable electrode, built-in temperature sensor, amplified electrode, automatic temperature compensation, one/two-point calibration, BEPS low battery alerts, HELP key messages

Specifications

SKU HI99121
Product Name Direct Soil Measurement pH Portable Meter – HI99121
Quote Required Yes
pH Range -2.00 to 16.00 pH; -2.0 to 16.0 pH
pH Resolution 0.01 pH; 0.1 pH
pH Accuracy ±0.02 pH; ±0.1 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 ‐5.0 to 105.0 °C/23.0 to 221.0 °F
pH CAL Check (electrode diagnostics) probe condition indicator
mV Range ±825 mV (pH‐mV)
mV Resolution 1 mV
mV Accuracy ±1 mV (pH‐mV)
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 (up to 60°C); ±1.0°C (outside) / ±1°F (up to 140°F); ±2.0°F (outside)
pH Electrode HI12923 glass body, pre-amplified pH electrode for soil measurement with internal temperature sensor, quick connect DIN connector and 1 m (3.3’) cable (included)
Automatic Shut-Off user selectable
Battery Type/Life 1.5V (3) AAA / approximately 1400 hours of continuous use; auto-off after 8 minutes of non-use
IP Protection IP67
Environment 0 to 50°C (32 to 122°F); RH max 100%
Dimensions 154 x 63 x 30 mm (6.1 x 2.5 x 1.2”)
Weight 196 g (6.91 oz.)
Ordering Information HI99121 is supplied with HI12923 pH electrode, HI721319 soil auger, HI7051M soil preparation solution (230 mL), HI70004 pH 4.01 buffer solution sachet (20 mL), HI70007 pH 7.01 buffer solution sachet (20 mL), HI700663 cleaning solution sachet for inorganic soil deposits (20 mL), HI700664 cleaning solution sachet for organic soil deposits (20 mL), 100 mL plastic beaker, batteries, instructions, and a hard carrying case.

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