The developed apparatus can automatically measure evapotranspiration at setting up interval and memory the data through a 32 kilobyte data storage memory . measured data can be transmitted to personal computer by rs232 series communication interface . apparatus will be trigged at measurement time by a real time chip set in it 该仪器通过实时时钟芯片实现间隔采集动作的触发及时间、日期的计数；利用液晶显示器( lcd )进行显示；使用它能在无人监管的工作环境下，定时进行蒸散测量并将测得数据自动保存到32k数据存储器中；再通过rs232串行通讯接口将数据传送到pc机进行进一步处理。
