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1. Model number: PS-668 Patent number: 200530055945.52, Three-row display with metal case;3, 60 measurements can be saved and recalled. The precise time reaches 1/100second;Display all time process with FS, SL and AV function;4, Countdown function;It can measure 9 hours 59minutes59seconds; 5, The frequency can be chosen with the range from 10times/minute to 320times/minute;6, Alarm clock and calendar function;7, Quakeproof, antimagnetic and waterproof function;8,Color is optional and could meet client's needs to do OEM.