The Peterson Strobe Center 5000 .... is the most advanced tuning device ever developed. This easy and fun to use tuner links the proven 12 window strobe-tuning method to precision microprocessor digital and motor control technologies, providing a versatile tuning instrument with unsurpassed accuracy and features. Its simple and intuitive operation makes it a pleasure to use for all music educators, music students, musical instrument maintenance professionals, manufacturers, and other users with precision tuning applications. VISUAL RANGE: Seven Octaves from C=16.352 Hz to B=3951.064 Hz; Eight Octaves when using the DISPLAY +2/-l Feature. ACCURACY: Equal Temperament Scale, All Preprogrammed Alternate Temperaments, Built-In Stretch Tuning Tables, User Definable Temperaments and Stretch Tuning Tables are guaranteed to be within 1 / 10 of 1 / 100 of a semitone (1 / 10 of one Cent, or 0.006%) KEY SELECTION: Choice of Bb, F, Eb (in addition to C) key signatures for instruments not tuned in C. Strobe Patterns display in the note window corresponding to the note sounded for instruments tuned in, B b, F, E b (and C.) STROBE DISC DRIVES: Each of the 12 strobe discs is driven by an individual microprocessor-controlled computer-grade motor. PREPROGRAMMED TEMPERAMENTS: Equal Temperament, Pythagorean Tuning, Just Intonation-Major Mode, just Intonation-Minor Mode, Quarter Comma Mean-Tone, Werckmeister-111, Kimberger-III, and Young Temperaments. BUILT-IN STRETCH TUNING TABLES for Concert Grand, Studio Grand, Small Grand, Full Upright, Console Upright, and Spinet pianos. CUSTOM DEFINABLE MEMORY - Capacity for either 225 Custom Temperament files or 32 Custom Stretch Tables, or a combination (such as 112 Custom Temperaments and 16 Custom Stretch files.) ELECTRICAL SPECIFICATIONS - Operates on 105-125 or 210-240 Volts AC 50/60 Hz. Sensitive built-in condenser microphone. 1/4" jack input for external microphone (e.g. peterson part #: 170172) or pick-up with Mute-controlled Patch-Through Output. CONTROLS - Power On/Off Switch (rear panel,) Digital Pitch Vernier Up/Down Switches, Mute, Enter, Display +2/-l Selection, Key Selector, 4 Menu-controlled Function Switches, Electro-Luminescent LCD screen with 80 Characters, 12 Strobe-Wheel Tuning Windows each labeled with the corresponding note of the chromatic musical scale. SIZE: 71/2" x 21 1/4" x 141/4" (19.lcm x 54.Ocm x 36.2cm) Custom crafted wood case covered in black Moroccan grain, scuff resistant leatherette. Detachable Cover includes retainer for removable power cord. NET WEIGHT: 26 pounds (1 1.8 kg) SHIPPING WEIGHT: 29 pounds (13.2 kg) GUARANTEE: Instrument is guaranteed to be free of defects in material or workmanship for a period of one year from the date of sale. During this period we will, at our option, repair or replace any instrument free of charge, provided the warranty card supplied with the instrument is returned to the factory within thirty days of the date of sale to the original purchaser. This warranty gives you specific legal rights, and you may have other rights which vary from state to state.