Battery operated Truncheon meters measure conductivity in EC, CF and ppm (500 and 700 scales). Durable, analog systems require no calibration. Truncheon measures EC in the range of 0.2-3.6 mmos/cm. Commercial Truncheon extends the EC range from 0.4-6.0 mmos/cm. Both models are fully waterproof, have auto on/off functions and are virtually indestructible.