DT47-FT  Fuel Tester.
This is the latest version of the Digatron Fuel Tester.  It now incorporates a thermometer for easier and faster comparisons between samples.  Priced at just AUD$645.

Designed to keep racing safe and legal, Digatron's fuel tester is the best deal on the market. It is a small, easy to use fuel indicator that performs two tests to detect the addition of oxidizers to fuel. In addition the DT-47FTD performs a temperature reading for consistency.