The Peterson StroboPlus HD (SP-1) is THE premier desktop digital tuner on the market! Equally as comfortable on a tech’s workbench as it is in a player’s guitar case, this tuner, with all of its features, is no exception to Peterson’s reputation for being THE most accurate in the industry — don’t let its demure palm size fool you! Players of both acoustic and electric instruments can rest assured— a built-in electret condenser microphone and ¼” input jack provide excellent connectivity. Gone are the days of having to carry extra batteries and tripping over power cables during a performance! This tuner is rechargeable via computer bus or outlet power, and its large, circular screen is easily viewed in both the darkest and brightest environmental conditions.