At first, research the internet and get an idea about the features or specifications of a good quality automotive screw jack. You will get a better idea of what kind of jack you should look for.
Now decide what type of automotive screw jack you want to buy and then compare prices of different online stores that are selling automotive screw jack and chose the most economic one for you.
If you are not sure whether you should buy an automotive screw jack from an online store, then you can also visit the supplier or manufacturer.
By visiting the manufacturer, you can ask questions directly to the staff and if you think they are offering a top quality automotive screw jack, buy it.
Before leaving the manufacturer’s place, ask them to show you that how an automotive screw jack works. It will give you satisfaction that you have purchased the right product.
Also check if the manufacturer offers a warranty for automotive screw jack. If it does, then also confirm that when the warranty will get expired.