Bluelab Truncheon - CF, PPM and EC meter 

The Bluelab Truncheon Meter is the best selling hydroponics CF / EC Meter in the world. The Truncheon meter measures EC, CF and PPM scales. 

This multifunction meter is factory calibrated, fully waterproof and has auto turn on and off. It is powered by three standard AA batteries (not included). There are no external switches or adjustment knobs.

Why do growers prefer the Bluelab Truncheon? It's easy to use... easy to read... extremely accurate... and best of all its reliable.

The Bluelab Truncheon reads in EC (0.2-3.6), CF (2-36), and TDS in both 500 and 700 ppm scales (100-2520). Accurate within ± 4% of reading with a resolution of 0.1 EC.

Carries a 5-year manufacturer's guarantee.

More info from the Manufacturer (PDF format - Lots of detail.)