EC Measuring range: 0 to10000uS/cm 10.01-19.99ms 20.1-400mS/CMResolution: 1 uS/cm; 0.1 mS/CM;Accuracy: 2% of readingTDS Measuring range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0pptResolution: 1ppm; 0.1pptSalinity Measuring range: 0.00 to 25.00%Resolution: 0.01%Accuracy:0.01-5.00% (0.1%) 5.10-25.00% (1%)PH Measuring range: 0.01-14.00pHResolution: 0.01pHAccuracy:0.05pHtemperaturerange: 0.1-60.0 32.0-140Conductivity EC: Supports 3-point calibration automatic identification (1413us12.88ms and 111.8ms) with 3 calibration points (1413uS/cm 12.88mS/CM111.8mS/CM) pH: 1 point (6.86) or 2 points (6.86 4.00) (6.86 9.18) or 3points (6.86 4.00 9.18) can automatically identify the calibrationsolutionSize and weight:183 x 37 x 37mm(7.2 x 1.5 x 1.5in)/90g(3.2oz)Color: As ShownMaterial: plasticPackage Contents:1 x 5 In 1 Digital PH TDS EC Meter Pen1 x English instruction manualOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.