Tools
Meter Calibration Wizard
Walk through a proper pH or TDS/EC calibration, score the probe with a slope check, and keep a dated record of every calibration.
Step 1 of 5: Get your kit together
pH
- 1You need two fresh buffer sachets or bottles (pH 7.00 first, then 4.01 for acidic water or 10.01 for alkaline water).
- 2Also grab distilled or RO water for rinsing, two small clean cups, and a paper towel.
- 3Let the buffers and your meter sit in the same room for 20-30 minutes so they are the same temperature.
How often?
pH pens: every 2-4 weeks with daily use, or any time readings look odd. TDS/EC: every 1-2 months. Always recalibrate after a probe dries out or takes a drop.
Temperature matters
Buffers are labeled at 77°F / 25°C. Without automatic temperature compensation, a 10°F difference can shift pH by roughly 0.03 and EC by about 2% per °C.
Buffer shelf life
Sachets are single-use. Opened bottles last about 3-6 months (pH 10 goes off fastest — it absorbs CO2). Never pour used solution back in the bottle.
Calibration log
Nothing logged yet. Finish the wizard and save to start a history — handy proof of when each meter was last trusted.
Using a Bluetooth or WiFi probe? Pair it on the Connected Meters page and log readings automatically.