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Cherry MX Mechanical 4-Key Tester: Blue Black Red Brown Switches : ID 4974 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: AKWOX 9-Key Cherry MX Switch Tester, Keycap Puller, Keyboard Keycap, O-Ring Sampler Tester Kit : Electronics
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Amazon.com: Griarrac Cherry MX Switch Tester Mechanical Keyboards 9-Key Switch Testing Tool, with Keycap Puller and O Rings : Electronics
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Amazon.com: Griarrac Cherry MX Key Switch Tester Mechanical Keyboard Sampler Switch Testing Tool Kit, with Puller and O Rings (9-Key Printed PBT Keycap) : Electronics
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