Hanna HI 99121N Direct Soil pH Meter

Hanna HI 99121N Direct Soil pH Meter

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Item Details

The HI 99121N kit has been designed to address the question of correct and rapid measurement of pH directly in soil. Every item in this kit has been made to facilitate measurements in the field without compromising accuracy. With HI 99121N you can test the pH of soil directly or after preparation of a diluted sample. In order to measure the pH directly, the kit includes a plastic auger to perforate the ground.

The HI 1292D pH electrode has been designed for direct soil measurement. It has a conic, rugged tip and can be directly inserted in moist or soft soil. The electrode incorporates a temperature sensor right near the tip to enable it to measure and quickly compensate for temperature.

For higher degrees of accuracy, or for stony ground where the electrode may be damaged, use the specially made HI 7051M soil preparation solution. This solution is included in the package to help you measure pH more precisely by dilution.

The dual-level LCD shows the pH value from -2 to 16 with 0.01 resolution. It simultaneously displays the temperature on the secondary level. With a menu-driven custom microprocessor, the user is helped with clear prompts during operation and calibration.

  • New Larger LCD
  • Tutorial messages for calibration and setup
  • Missing Probe Indicator
  • New Rugged, thinner ergonomic case
  • Faster/Easier battery replacement

HI 99121N is supplied with HI 1292D pH electrode, ground auger, HI 7051M soil preparation solution, pH 4 and pH 7 buffer sachets, HI 700663 and HI 700664 electrode cleaning solutions, batteries, rugged carrying case and instructions.


RangepH-2.00 to 16.00 pH
Temperature-5.0 to 105.0C / 23.0 to 221.0F
ResolutionpH0.01 pH
Temperature0.1C / 0.1F
Accuracy @ 20CpH0.02 pH
Temperature0.5C (up to 60C), 1C (outside);
1.0F (up to 140F), 2F (outside)
pH Calibrationautomatic one or two point calibration with two sets of memorized buffers (Standard 4.01, 7.01, 10.01 or NIST 4.01, 6.86, 9.18)
Temperature CompensationAutomatic, -5 to 105C (23 to 221F)
pH ElectrodeHI 1292D glass body, pre-amplified pH electrode for soil measurement with internal temperature sensor, DIN connector and 1 m (3.3') cable (included)
Battery Type / Life1.5V AAA (3) / approximately 1200 hours of continuous use. auto-off after 8 minutes of non-use
Environment0 to 50C (32 to 122F); RH max 100%
Dimensions152 x 58 x 30 mm (6.0 x 2.3 x 1.2")
Weight205g (7.2 oz.)

Item Specifications
Item Number: 135732
Manufacturer: Hanna Instruments
Manufacturer's Part Number: HI 99121N

Additional Documents
pdf file Literature
pdf file Instructions

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