What is this tool?

[mklotz]

Although it looks a lot like a flintlock tinder lighter, I believe it's a gunpowder tester.

The curved arm is lifted and a charge of powder to be tested is placed in the small container so revealed. When the flintlock fires, this powder is ignited and its force blows the curved arm upward. Said arm is attached to the ratchet which rotates with it and catches the arm at its greatest angle. Thus the angle of the arm is a measure of the power of the powder under test.

Pressing the pivoted ratchet pawl behind the frizzen allows the curved arm to snap back into the rest position shown.

Am I correct?