● Instrument provides fast and standard modes for crack depth measurement. ● Instrument can real-time display of the waveforms and the first wave, with acoustic parameters automatically calculated. ● High receiving sensitivity helps to recognition of the weak signal and detect defects' size and scope accurately. ● Instrument can automatically record the ambient temperature and the test time. ● Users can view, save, delete and analyze the results on site. ● Powerful professional data analysis and processing software based Windows is designed. All the test data can be uploaded to the PC through the USB port. Users can analyze the result data, form in Word or Excel and print. Human-computer interaction ● Touch screen operation simplify the test process simple and quick. ● Voice announcing and text prompts is extremely friendly to users. ● Instrument has a variety of helping documents and video presentations of how to operate the instrument. Mass storage  ● 2GB SD can store more than 100,000 measurement results. Low-carbon energy ● Rechargeable highly efficient lithium batteries decreases power consumptions.