Digital pH Pen Meter
Details
A pocket pH pen for freshwater tanks. Reads 0.00–14.00 pH to 0.1 resolution, runs on two 1.5 V cells, and calibrates against standard buffer powders.
- pH only. This pen does not measure TDS. An earlier version of this listing said it did; it does not, and we have corrected it.
- 0.1 pH resolution across the full 0–14 range — enough to track a CO2 swing or a KH change day to day.
- Two-point calibration against standard buffer sachets, which is what keeps a cheap pen honest over time.
Specifications
- Measures
- pH only
- Range
- 0.00 – 14.00 pH
- Resolution
- 0.1 pH
- Power
- 2 × 1.5 V cells
- Calibration
- Two-point, buffer powder
No TDS function
- Category
- Aquarium Water Test Kits
- Shipping
- See delivery times
- Returns
- 30 days
Questions about this light
Frequently asked questions
Does this measure TDS?+
No. This listing previously said it did — that was wrong and we have corrected it. The unit our supplier ships is a pH-only pen. If you need TDS you need a separate meter, and we would rather lose the sale than send you the wrong tool.
How often does it need calibrating?+
Monthly for most tanks, or any time a reading looks implausible. Calibration sachets are cheap and the pen drifts without them.
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