Feature 1、5 in 1: This water quality test pen can measure PH, salinity, temperature, TDS and EC, multifunctional. 2、IP67 Waterproof: Using sophisticated production technology, IP67 waterproof, it can still be used after falling into the fish tank. 3、Water Quality Meter: The multifunctional water quality tester is automatically calibrated, with replaceable probes, with backlit. 4、Measurable Salinity: Measurable salinity (sea salt, freshwater salt). Sea Salt: The measurement range of sea water salinity is 10.1‑200.0ppt. Light salt measurement range: 0.00‑25.00%, accuracy: 0.01‑5.00% 5.10‑25.00%. 5、Uses: It is suitable for the determination of various values of water quality in drinking water, aquaculture, swimming pools, etc. Item Type: Digital Water Quality Meter Material: ABS Conductivity Test Range: 0 to 10000us/cm 10.01-19.99ms 20.1-400ms/cm Resolution: 1us/cm; 0.1ms/cm Accuracy: ±2% of Reading TDS Test Range: 0 to 10000ppm 10.1 to 200.0ppt Resolution: 1ppm, 0.1ppt Accuracy: ±2%f.s of Reading Salinity Measurement Range: 0.01% to 25.00% Resolution: 0.01% Accuracy: 0.01-5.00% (±0.1%) 5.1-25.00% (±1%)±2%f.s PH Test Range: 0.00-14.00ph Resolution: 0.01PH, Accuracy: ±0.05ph Temperature Compensation: Automatic Temperature Compensation (ATC) Working Environment: 0 to 60.0℃ (32.0-140℉), RH 100% Temperature Range: 0-60.0℃ 32.0-140℉ Temperature Accuracy: ±0.5℃ Temperature Resolution: 1℃/℉ Automatic Shutdown: 5 Minutes Battery: 3 x LR44 (not Included) Waterproof Grade: Ip67 Uses: Suitable for the Determination of Various Values of Water Quality in Drinking Water, Aquaculture, Swimming Pools, Etc. Weight: Approx. 140g / 4.9oz Package List 1 x Digital Water Quality Meter1 x User Manual 3 x Testing Powder