

TDS Meter for Water EZ-9909, 5-in-1 pH, EC & Salinity Pen
The EZ-9909 is a 5-in-1 TDS meter for water that also reads pH, EC, salinity and temperature in one pocket pen. It is suited to aquarium and pond keepers, hydroponic growers, pool owners and anyone testing water quality at home or on site.
Technical specifications
| Specification | Value |
| Model | EZ-9909 |
| Functions | pH, TDS, EC, salinity, temperature |
| pH range | 0 - 14 |
| pH resolution | 0.01 |
| Salinity range | 10.1 - 250.0 PPT |
| Calibration | 1/2/3-point, buffers 4.01 / 6.86 / 9.18 |
| Display | Backlit LCD |
| Power | 3 x LR44 button cells |
| Size | 183 x 37 mm |
| In the box | EZ-9909 tester pen, 3 pH buffer powder sachets, user manual |
What does the EZ-9909 water quality tester pen measure?
The EZ-9909 measures pH, TDS, EC (conductivity), salinity and temperature.
How do I calibrate the EZ-9909 pH tester?
It supports 1, 2 or 3-point calibration with automatic recognition of pH 4.01, 6.86 and 9.18 buffer solutions; buffer powders are included.
Can the EZ-9909 test salt water?
Yes. Its salinity range is 10.1 to 250.0 PPT, which covers sea salt testing.

When will my order arrive?
Dispatched within 1–2 working days. Delivered in 5–7 working days after dispatch.
What is the return policy?
You can return an instrument within 30 days. See our returns page for details.
Is checkout secure?
Payment is processed through Shopify's secure checkout.
How can I contact support?
Email support@ekodeluxe.co.uk.