HOW I CHECK OUR RV FOR A PROPANE LEAK USING GASSTOP

We use the GasStop Propane Valve to periodically check our RV for a slow propane leak.

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[barbwire]

This would be a very useful device for me.
About 13 years ago I fell and hit the back of my head on some tile. I hit my head so hard falling I fractured my skull.
I also lost my sense of smell because I hit my head so hard. I will never be able to get that back. What that said, that device could let me know if there is a leak.
Do I need to order 2 for each tank or just 1?