1. pH range 0.00 to 14.0 pH; Resolution 0.01pH ; Accuracy +/-0.2 pH

2. Calibration : manual, two point

3. Enviroment: 0.0 - 50.0 ^oC or 32.0 - 122.0 ^oF ; RH 95%

4. Battery type:  2x1.5 V /appoximately 3000 hrs. of continuous used

5. Dimension 60x50x25 mm. ,weight 70 g.