Bicycle Chain Checker Gauge

I couldn't find any bike chain checkers on here, so I created my own. Turns out if I used the keywords "chain gauge", well I would have found some. Too late now of course, so here it is.

I've put the length on the part so you can calibrate it to suit. I printed mine at 100.2% to get it the correct length. Also includes chain hook so you're not fighting the derailleur to get your chain linked.