1、The 5 in 1 multifunctional water quality tester measures PH, TDS, EC, salinity and temperature. 2、It features high performance, pen shape, fast numerical stability and accurate calculation result. 3、IP67 waterproof, this meter can still be used when dropping into the fish tank, convenient to use. 4、Replaceable probe, automatic calibration and high reliability, easy to operate. 5、The salinity can be measured. The seawater salinity is the ratio of total dissolved solids to the weight of sea salt in seawater. It is usually expressed in g/kg seawater and the measurement range is 10.1‑200.0ppt. Light salt refers to light water with a salt content of less than 0.5g/L. The measurement range is 0.01‑200% and the accuracy is 0.01‑00%, 10‑200%. 1 x Water Quality Tester (Battery Not Included)1 x User Manual Item Type: Water Quality TesterMaterial: ABSEC Test Range: 0 to 10000uS/cm 10.01- 19.99ms 20.1-400mS/CMResolution: 1uS/cm; 0.1mS/CMAccuracy: ±2% of the readingTDS Test Range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0pptResolution: 1ppm; 0.1pptAccuracy: ±2% of the readingSalinity Test Range: 0.01 to 25.00%Resolution: 0.01%Accuracy: 0.01- 5.00% (± 0.1%) 5.10- 25.00% (±1%)pH Test Range: 0.01- 14.00pHResolution: 0.01pHAccuracy: ± 0.05pHTemperature Compensation: Automatic Temperature Compensation (ATC)Working Environment: 0 to 60.0℃ ( 32.0-140℉); RH 100%TDS Factor: 0.5Temperature Range: 0.1- 60.0℃ 32.0-140℉Temperature Accuracy: ± 0.5℃Temperature Resolution: 0.1℃/℉Battery: 3 x 1.5 LR44 Button Battery (Not Included)Automatic Power-off: 5 MinutesWaterproof Grade: IP67Power Consumption: 2.9mA, power consumption for shutdown is 0Feature: Within 150ppt, the accuracy is relatively accurate, while above 160ppt, the deviation is relatively large, the electrode should be cleaned after each use.Display Screen Size: Approx. 33 x 24 mm/ 1.3 x 0.9 inProduct Size: Approx. 183 x 37 x 37 mm / 7.2 x 1.5 x 1.5 inWeight: Approx. 160g / 5.6oz