... -1A Handy Display Velocity Measurement InstrumentIntroductionHT-1A handy display velocity measurement instrument (flow counter) is an equipment used in ... counter is composed of 8×4 characters liquid crystal display screen, single chip, RS232 communication port, signal receiving ... 30 hours)Storage: Store 999 groups dataCommunication: RS232Clock: Can display year, month, day, hour, minute, and second ...