Whether you’re an avid player or looking to take up the guitar, the TonicalTuner solves the age-old problem of strings going out of tune with just a strum of your fingers. This mechanized add-on is from the German company that brought you Gibson’s Min-Etune, but those are built into Gibson’s models already. With the TonicalTuner, there’s no need to buy a new guitar and it fits with models other than Gibson (both electric and acoustic). Simply strum your guitar after the $299 TonicalTuner is installed, and watch the tuning pegs automatically turn. Battery lasts for 300 tunings, so get shredding.