A high-precision calibration instrument specially designed for amateur users, Professional design! Compared with similar products, its performance accuracy is better, featuring anti-magnetization. Using three ceramic filter capacitors, professional signal processing chips and foam to reduce noise and shock Excellent hardware design and analysis software Can measure day difference, polarization, amplitude, frequency, dotted line, waveform graph and rise angle settings Rugged and reliable housing made of hard plastic Professionally integrated power amplifier operation circuit and vibration sensor, fully enclosed noise reduction and sound insulation cavity inside The interior is composed of circuits, which not cause magnetization in tests Can be used with desktops, laptops and tablets for XP, 7, 8 and 10 Support for connection to Android cellphone to use Colour:As Shown Material:Plastic Package Contents: 2 x Watch Timegrapher Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.