Bluetooth smart technology (low energy) for outstanding battery life. Operate up to 10m distance from compatible pH electrodes for versatile measurement in the lab or field. Light weight and easy to hold meter works well as a portable meter. If you prefer the traditional bench top approach just place edge in its cradle on the bench. Range     basic mode  -2.00 to 16.00pH    ,      Standard mode -2.000 to 16.000 pH. Resolution 0.001pH, 0.01pH. Accuracy (@25°C) ±0.01 pH, ±0.002 pH.