1.Touch keyboard, LCD digital display, easy to use. 2.The use of spectrophotometric colorimetry principle.Putting the water samples into the reagent, one minute after the reaction can be read, the figures show the value of ozone. 3.Small size, easy to carry. Black lettenting on white background Large window digital black text HD display Memory storage system 20 Groups of measurement data can be stored Can be rechargeable or equipped with batteries can be rechargeable or equipped with batteries Instrument keyboard description Power:turn on and off Menu:operate the instrument by selecting measurement,calibration,and settings Swithch:select the measurement mode by switching,and forcibly exit by pressing the “swithch”key in the correction state Query:extracting previously saved data Enter:confirm key,Press this key to confirm the previous operation Store:Save the data needed for the measurement ???????? ???? Portable battery can be installed,Aslo，can be used in recharge, free from the hassle of frequent battery replacement ???????? ??? ?????? Arc corners for a more comfortable feel when using ???????? Portable carrying case,easy to carry, filled with foam to ensure the protection of equipment ??????? ????? ?????? To ensure the safety of samples in case of accidents Waterproof button for safe use When meansuring，there is no need to worry about the impact of liquid entering the interior of the machine on service life and safety issues Parameter 1. Measuring range：0-2.5mg/L 2. Voltage：DC: 1.5V×5Dry battery(Do not included) AC: 220V 3 Resolution:0.01mg/L 4 Repeatability1% 5 Linearity error:±5％ The portable tester is applying to test the ozone level in water. It is widely used in water supply, food, environment, medicine, chemistry, pharmacy and print works for the ozone level testing on site or at labs.