Keyboards are great, but there's more to life than our typey, clicky friends. For example, check out this swell deal on a genuine
Madsen Zodiac 901 Middle-Ear Analyzer Tympanometer:

It can not only be used to check your middle ears (which, as you know, many GHs have), but to check how in-tune your tympani are:

Units like these are usually well over $1000, so act now! And yes, they do have a few buttons, but they don't really qualify as KBs, so you're okay there.