Total Tester has a known issue with the interface becoming distorted on a HighDPI system such as the Microsoft Surface. This is caused by the stable public versions of Java not supporting these types of screens yet. The upcoming Java 9 has support for the HighDPI screens and is currently available as an Early Access Release.
If you are experiencing this distorted interface problem on your system. You can use these following steps to install and run Total Tester on top of Java 9.