There is also this 3x3 one on Amazon, it works fine: https://www.amazon.com/Cherry-Switch-Tester-keyboard-Sampler/dp/B01GZHU1EG/ https://www.amazon.com/Cherry-S

There is also this 3x3 one on Amazon, it works fine: https://www.amazon.com/Cherry-Switch-Tester-keyboard-Sampler/dp/B01GZHU1EG/ https://www.amazon.com/Cherry-Switch-Tester-keyboard-Sampler... Comes with "9 Different Cherry MX Switches: Cherry MX Red(1), MX Black(1), MX Blue(1), MX Brown(1), MX Green(1), MX Gray-brown(1), MX Gray-black(1), MX Clear(1), MX White(1)".