This is a Boss TU-2 Tuner. Has some show of were. Works well. 

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The BOSS TU-2 Chromatic Tuner incorporates BOSS' world renowned TU-Series tuner technology into an ultra-convenient stompbox design. For the first time ever, guitarists and bassists can now tune their instruments with unrivaled accuracy and an unmatched tuning range--with just a single stomp.

• BOSS world-renowned TU-Series tuner accuracy in a convenient stompbox design 
•  Mute/Bypass select for silent tuning with a single stomp 
•  11-point LED indicators and new "stream" meter display tuning discrepancy via speed and direction of LEDs (speed of LED movement gets slower as pitch becomes more accurate) 
•  7-segment LED displays string and note names, easily visible on dark stages 
•  Seven easy tuning modes include Chromatic, Guitar Regular, Guitar Flat, Guitar Double Flat, Bass Regular, Bass Flat, Bass Double Flat 
•  Tuning mode setting and display style choice stored in memory 
•  Adjustable reference pitch from 438 to 445Hz 
• 8-octave tuning range--the widest in its class
• Footswitchable Tuner Off mode preserves battery life by disabling LEDs