Bluetooth 40 transmission stable multimeter and mobile phone real-time display on the same screen. The Bluetooth recorder function automatically records the numerical values of the measured object, and the chart mode can clearly see the changing trend at a glance.Set the sampling interval (1 second to 4200000 seconds) and record the number of points (0 to 10000 points), disconnect the multimeter from the phone, and the internal chip will automatically save the data.After recording and analyzing the data, simply use the mobile app to read the data in the table. If the battery level is low, the multimeter will automatically shut down for data protection.When the non-contact voltage sensing area is close to the conductor, the instrument will the indicator light and emit different frequency beep alarms based on the detected AC voltage intensity.Universal watch strap with shockproof protective sleeve design, scratch resistant, impact resistant dual protection, and more reliable use, making measurement worry freeMaterial: ABScolour: As ShownPackage Contents: 1 set OW18B Digital Multimeter kitOnly 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.