Uable to fetch data from weighing scale using Bluetooth device

I want to retrieve data from a digital weighing scale which is having a Bluetooth device. I am able to connect to the device but I am unable to fetch data from the device. I used Ionic native BLE plugin to connect and retrieve data.

I used services and characteristics which we get from the plugin still not able to fetch data.

Please help me out for this.

Weighing scale is OHAUS company.