Measurement range: Main unit/-2 to 20pH Resolution: 0.01pH Accuracy: ±0.01pH Number of memory points: 200 Size (mm): 222 x 70 x 35 Weight (g): 270 Dust and waterproof: IP67 Material name: Main unit set S2 standard kit Power supply (v):4 x AA电池(包括用于测试) 电源:4 x AA电池(包括用于测试)