2 in 1 Digital Water Quality Tester PH Salinity Meter Water Analyzer Smart Monitor For Aquarium Pool Spa Seawater Horticultural     Feature:     1.PH-2685 monitor is ideal for seawater, horticultural and hydroponics applications where pH and Salinity levels need.     2.to be continuously monitored for optimal plant growth.     3.The continuously monitor and display the pH and Salinity values of a solution on an easy to read in one LCD's. It is compact and easy to install and use.     4.This makes them ideal for all continuous monitoring applications.     Specifications:          Range:pH 0.00 ~ 14.00 pH,Salinity:0.00 ~199.9pt      Resolution:pH 0.01pH,salinity:0.1ppt      Accuracy:±0.1pH,salinity:±2%F.S      Battery:DC6V      Temperature Compensation:0~50 degree C      Operating Temperature:0~50 degree C      Dimensions:130*77*31mm      Weight:180g      Operating Steps:            1.Remove the protective cap,connect pH electrode into relative electrode socket.       2.Wash electrodes in distilled water,and dry it by filter paper.       3.connect to power adaptor to turn on.       4.Put pH electrode,salinity electrode into liquid which is to be best,and stir lightly.Wait until the digital is stable,read the final value.       5.After use,wash electrodes,put on protective cap.