8
mEASU
rE
m
ENT
Stand-Alone Tester (Up to Three-Point Calibration)
1. Press and hold ON/OFF button until “
CAL
MODE
” is displayed.
2. When “
7.01
USE
” or “
6.86
USE
” is displayed with “CAL” tag blinking, place the tip of the electrode in the
correct buffer.
CAL
MODE
7.01
USE
3. The buffer is automatically recognized. “
WAIT
” is displayed with the stability indicator blinking until the reading is stable.
Wait until the measurement is stored and the stability indicator disappears.
7.01
REC
#
7..01
WAIT
4. To save a one-point calibration and return to measurement mode, press the ON/OFF button.
“
CAL
SAVE
” is displayed briefly.
5. Place the electrode tip in the next buffer. Repeat step 3.
6. To save a two-point calibration and return to measurement mode, press the ON/OFF button.
“
CAL
SAVE
” is displayed briefly.
7. Place the electrode tip in the next buffer. Repeat step 3.
After the third point has been stored, “
CAL
SAVE
” is displayed briefly and the tester will return to measurement
mode automatically.
With Hanna Lab App (Up to Four-Point Calibration)
Connect the tester to the Hanna Lab App and follow the calibration procedure.
See the App Help section for the calibration procedure.
10. MEASUREMENT
The pH tester allows direct testing in the soil without taking samples or creating a slurry.
1. Inspect the pH probe to ensure the bridge electrolyte gel has not dried out. Refill if necessary.
2. Calibrate the pH probe.
3. Using an auger (
HI721319
), make a 20 mm (0.78”) hole down into the soil.
The hole needs to be the same depth each time to avoid pH discrepancies.
4. Add some distilled or deionized water to the hole; the soil should be damp but not saturated.
5. Rinse the electrode with tap water and insert into the hole.
6. Allow for the reading to develop or stabilize.
7. After measurement, gently rinse off leftover soil (avoid using cloth or wipe).
Note:
Direct soil pH testing is not recommended if the ground is stony or hardened as the electrode can be damaged.
If the soil is stony or hard, take a representative soil sample and add
HI7051
Soil preparation solution.
11. CARE & MAINTENANCE
• Never immerse the tester over the maximum immersion level.
• Fresh buffers should be used for each calibration. Once the sachets are opened the buffer value can change over time.
• If the electrode is slow or sluggish, soak it in cleaning solution for 20 minutes. Rinse with water and hydrate the
electrode in storage solution for a minimum of 30 minutes before calibrating.
• If measurements are taken successively, rinse the probe thoroughly in distilled or deionized water to eliminate
cross-contamination between measurements.
