I have a 200$ Chinese tablet and trust me when I say stay away from them , especially if you are testing websites you can't get the experience you need they can get very very laggy.
Get a samsung tablet they aren't expensive for the 7 inch , or get a used 10 inch you can find one in good condition
Here are the list of prices from stars communication
Note 8.0 N5100 345$
Note 10.1 N8000 445$
Note 10.1 (2014) P601 490$
Note Tab 12.2 P901 670$
Tab 2105 152$
Tab 3 T110 7" 133$
Tab 3 T111 7" Lite 170$
Tab 3 T210 7" 165$
Tab 3 T211 3G 8G 215$
Tab 3 T211 3G 16G 237$
Tab 3 T311 305$
Tab 4 T230 190$
Tab 2 10.1 P5100 315$
Tab 3 10.1 P5200 345$