5
Cleaning & Maintenance
After approximately 3 years of use batteries require replacement. When the tester is placed in nutrient water
LED lights light up along the conductivity scale (and back), and display low‑battery warning:
420
300
0.6
replace batteries
Users should replace the batteries before they run out as the accuracy of readings may decrease as the batteries
run out.
5.3. BATTERY REPLACEMENT
Do not mix different brands of batteries or old batteries with new ones.
To replace the batteries:
1. Rotate the battery cap counter clockwise to remove.
2. Take out the old batteries.
3. Insert the new batteries (1.5V AA type) with negative end (–) first.
4. Tightly screw the battery cap back on.
6. CLEANING & MAINTENANCE
Quickly rinse the tester after use to prevent build up of excess between the two graphite electrodes.
If a more thorough cleaning is required:
1. Rotate the crown‑shaped cap counter clockwise to remove.
2. Rinse under a stream of running tap water.
3. Use a soft material (soft bristle brush) and soapy surfactant to thoroughly clean the space between the
electrodes.
4. Rinse and shake excess water off.
7. STORAGE
The tester should be stored dry and clean.
