• Remove the protective cap. Don't be worry if white crystals appear around the probe head. This is normal with pH electrodes and they dissolve when rinsed with water.
• Turn the meter on by sliding switch on the top.
• Immerse into solution up to the max immersion level.
• Stir gently and wait until the display stabilizes.
• After use, switch off pH meter, use the water clean the electrode and replace the protective cap.
• Large fluctuations in readings could be due to lack of calibration, dry electrode or rundown batteries.