How can I conduct the precise internet speed test?

Personally, I think that you can use the internet speed checker of your internet service provider as they are more authentic and reliable. The reason is that they never flout their statistics for influencing their own customers. Whereas the third-party internet speed checker website never maintains this norm. Somehow, they bloat their internet speed statistics to their expected figure. However, still if you are doubtful about your ISP's result so you may go to Speedtest website where you will get the nice graphical presentation of your internet speed. As far as my experience is concerned, I always follow my ISP's speed checker. The accuracy of internet speed is always doubtful because of the network congestion. In real time, you will never get the accurate result of internet speed. Practically, it is impossible. The reasons are various relating to the internet network connection and the implementation of the internet infrastructure. The testing procedure of the internet speed depends on the download speed and upload speed. The speed rate actually compared with T1 line transmission, which is the highest limit of the internet speed backbone. So it is better to stay with your internet service provider and get the friendly service from them as it will develop a positive relationship among you and your internet service provider.