You just give GPS Permission to this Online Speedometer and you will be able to get your current speed without installing any app.
To test train speed, first you have to enable GPS in your mobile as you turn on the data now you have to turn on the location of the device and your live speed will be visible in speedometer.pbmarketing.co.in.
First of all enter https://speedometer.pbmarketing.co.in on Google in your mobile and search now turn on the GPS of your mobile phone and your live speed will come in front of you.
Make sure you gave permissions to this website and the browser.