One way is to export to tsv format:
Export["~/Desktop/lst.tsv",
{{195, 0.81}, {200, 0.33}, {205, 0.68}}]
Import["~/Desktop/lst.tsv", "Text"]// InputForm
You can also do it one step at a time:
{{195, 0.81}, {200, 0.33}, {205, 0.68}};
Map[ToString, %, {2}]
Map[Riffle[#, "\t"] &, %]
Riffle[%, "\n"]
% // Flatten
% // StringJoin // InputForm
