TDS (Total Dissolved Solids) Water Quality Sensor

Pimoroni

£8.25

Use this sensitive measurement board to determine the quality of water based on its total dissolved solids or TDS. Find out wether your tap water is clean, or keep an eye on your aquarium water, and more! This set includes the measurement board as well as a detachable water-proof measurement probe of 60 cm. The board has a standard 3-pin header interface connector and has a simple analog voltage readout. The TDS measurement ranges from 0 - 1000 ppm, and has an accuracy of ± 10 % full-scale at 25 °C. Features detachable water-proof measurement probe included sensitive measurement board with sim

Pimoroni's own words, read from their page.

Buy from PimoroniOut of stock. Price seen 2026-09-05. Affiliate link.

Where this comes from

The part other shops don't tell you. Three separate questions, kept separate on purpose, each with its source.

UK company
Registered at Companies House as PIMORONI LTD, number 07510759. Checked 2026-08-29.
Means the business is a British legal entity, not a British-sounding name owned elsewhere. It says nothing about where anything is made.
UK operations
Stated by the company: "moving into our (hopefully) forever home at Parkway Drive - our first building with a roof that didn't leak" — names a location but no site or process, so this corroborates uk_hq more than operations. Source.
Means people employed here, or premises they actually work from. We keep this separate from the company badge because a registered office can be an accountant's spare room, and a company can be registered in Britain while everything it does happens somewhere else. Where we have not looked, we say so rather than assuming.
British-owned
No majority shareholding traced outside the UK. Companies House.
Read from the register of people with significant control, following the chain of holding companies. It does not gate anything: a firm can be made here and owned elsewhere, and that is worth telling you rather than hiding.
Where it is made
The maker doesn't say, so neither do we.
This is about the individual product, not the company. A British firm can sell things made abroad, which is normal and not a criticism. We would rather tell you which is which than average them into a score.