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Peterson 490-ST AutoStrobe Tuner with Stretch Tuning

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#210046 000000000
Product Price $848.11
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The Peterson 490ST AutoStrobe Tuner with Stretch Tuning allows automatic (handsfree) note selection for fast, accurate tuning of instruments for stud...Click To Read More About This Product

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So fast you can check your intonation while playing.

The Peterson 490ST AutoStrobe Tuner with Stretch Tuning allows automatic (handsfree) note selection for fast, accurate tuning of instruments for students, technicians, and musicians at all levels. This feature also permits realtime display of intonation to improve performance and listening skills while playing. Includes stretch tuning capabilities for enhanced tuning of stringed or percussive instruments such as the piano, bass, guitar, marimba, steel pan, and others. Only Peterson strobe tuners respond at the speed of light to display relative tuning of any audio source to 0.1 of a cent (1/1000 of a semitone) accuracy.

Wide selection of preprogrammed stretch files

Tables with optimized tunings for all piano types and sizes takes the drudgery out of piano tuning. Up to 31 additional files may be programmed by the user.

Automatic note selection, automatic image clarity, and contrast control

Internal compensation for optimal viewing over a wide range of source pitch and volume.

Improved clarity for upper and lower register notes

The +2/-1 display feature shifts the strobe patterns into more visible middle ranges. Bass note patterns can be displayed two octaves higher and treble note patterns can be displayed one octave lower in strobe display.

Easy transposition

Strobe patterns appear at the correct note for Bb, F, and Eb instruments.

External input and through output with mute

For inline, silent tuning during performances.

  • Fast as light
  • Accurate to 1/1000 of a semitone
  • Automatic note selection
  • Tables with optimized tunings for all piano types
  • 31 programmable files
  • Strobe patterns appear at the correct note for Bb, F, and Eb instruments
  • External input
  • Through output with mute
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Review Snapshot

by PowerReviews
Peterson490-ST AutoStrobe Tuner with Stretch Tuning

(based on 4 reviews)

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Reviewed by 4 customers

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(7 of 7 customers found this review helpful)


Pro Piano Tech

By Camelot Productions

from PA

See all my reviews

Comments about Peterson 490-ST AutoStrobe Tuner with Stretch Tuning:

From my experience in piano tuning, and my customers 100% satisfaction, I have to say it is worth it to buy this unit. I have been tuning pianos for 10 years and mostly by ear, spending more time counting beats than making money. This cuts out the time of "guessing" at times when your ear just is on the frits that day, or close to the end of tuning when your ear is "stretched" from listening to so many tones during a pitch raise, or on different pianos in one day.This simply makes it faster and easier to do accurate tunings quickly. I have tested this unit against my ear and other tuning units, and this is very accurate.
I use this as well as the ear for precise and accurate, perfect tunings that sound incredible. Any electronic unit has to be accompanied by your ear, so this is mainly a guide, but a pretty darn accurate guide at that. Each piano and instrument has it's harmonic properties, so this in combination with your knowledge of those peripherals will help you be much more accurate at a faster rate than the ear alone. If you don't have time to waste, and want an accurate tuning, use this unit.
It is easy to use with manual as well as automatic. I don't particularly trust anything automatic when it comes to tone, especially on a piano, which is what i use it for. Therefore I always use manual mode to eliminate any question of overtones eminating that can cause frequency drift. With it in manual mode, I am able to know that it is looking for that particular tone, and nothing more.
The push buttons are easy and large enough to read, instead of paging thourgh menus, like some software tuning devices that are only as acurate as the microphone you are using, as well as your computers sound card's ability to acurately recognize correct tone.
The handle is moveable to all directions and locks into position at your desired location making it easy to read and position on top of an upright or on the frame of a grand. The feet are rubber, making it nice to put anywhere without it slipping.
The unit itself it lightweight, and easy to get around. The menus are easy to access and get around in.
I would say the quality is very good, but lacks a modern feel. This is only cosmetic, and would probably take awy from the stability of the unit if it were shaped differently. With this shape and design, it is small enough to sit on top of an upright comfortably, and flat, where others would probably slip off. No computer will ever do that, so they must have been thinking ahead. The strobe window could be a bit better I think, maybe larger as to be able to see better from a distance. Maybe a larger extruded window of sort?
The overall quality is solid and dependable. With the panel buttons below the flat face plate, you don't have dirt or any other debri getting into the unit and ruining it, as well as spills. But I never tried the spills, so don't quote me on that, but it will protect the buttons for the occasional "splash" is something would get splashed on it, not to mention sweaty hands. Simply wipe off with damp paper towel, and POOF! Like new!
This unit is worth every penny I spent on it. There are other units that are made by different manufacturers that claim to be more accurate, and are much more money, but the same thing, and are less user friendly. If you find me ANY musician, technician, or anyone that can hear frequency differences of +/- .1 cents by ear, I will also sell you this bridge I know of in New York. This unit CAN provide that accuracy, so don't let the higher priced, RPT affiliate manufacturers fool you into believing you can't live without spending 2-3 times the price, because they are full of something brown. This unit has made me a lot of money, and paid for itself after just a few tunings.

(3 of 3 customers found this review helpful)


A great tool with a few issues

By Chris B.

from Undisclosed

Comments about Peterson 490-ST AutoStrobe Tuner with Stretch Tuning:

The Peterson 490-ST AutoStrobe Tuner with Stretch Tuning is an excellent tool for the musician to use at home. I am a violinist and I use it to check my pitch. I use a contact mike connected to the mic input on the front pane. The features I have used on it are the pre-programmed temperaments, octave shift, manual pitch selection, and enhanced (0.1 cent) tuning measurements. The strobe dial is brightly lit, and easy to read. It zeroes in on the note quickly, but not instantaneously. The accuracy is great! The carrying handle is adjustable and acts as a kind of stand to elevate the front panel for ease of viewing. There are a few disadvantages to this tuner. First, it's not very portable, so if you are taking it to a gig or transporting it from home to office and back, it gets to be a chore. It also makes a humming sound when operating--not a big complaint. The biggest problem I have is that at certain places in the octave it will not "read" the new pitch very quickly. I have to stop playing and let it "rest" for a second or two and then play the new note. This happens at the change of octave between B and C. It also does something similar if the second note is a fifth lower than the first, for example B going to E. It keeps reading the B, presumably because B is in the harmonic series of E and it's not reading the fundamental. Again, if I stop and wait a moment, and then play the E, it picks it up. Finally, the manual isn't as user-friendly as it could be. While these issues are frustrating at times, I would not go back to a "needle" tuner. My pitch has improved tremendously since I've started using this tuner, so I figure I've gotten my money's worth!

(1 of 1 customers found this review helpful)


This is great for professional piano tuning!

By Piano Tuna

from USA

About Me Professional Musician

Verified Reviewer


  • Easy To Use
  • Functional
  • Good Quality


    Best Uses

      Comments about Peterson 490-ST AutoStrobe Tuner with Stretch Tuning:

      I use this for tuning pianos - it is extremely accurate and easy to use. The built in stretch and temperament files make it easy to tune and gives excellent results. An electronic tuner is never a substitute for the skills of the piano tuner and there are always judgment calls and compromises to be made by ear, but honestly this tuner is AWESOME! I'm very impressed, it allows me to tune quickly and accurately because it's immune to background noise and false beats. I love that it has built in stretch and temperament files. I recommend buying this with both foot switch accessories if you are tuning pianos. I also use manual mode in my tunings so I won't comment on the auto tune functions. I don't use them.

      I do wish someone had prepared me for the noise of the mechanical strobes, this thing doesn't run silently, you can hear the strobe discs turning. I didn't like that at first, but wow, when I tuned the treble section the first time and experienced how quickly and accurately this baby helped me tune I was over it! Once you're aware of it, it's OK but I expected it to be perfectly silent and it freaked me out when I first powered it up.

      The strobes allow you to tune in a very intuitive way. This is an excellent device for tuning pianos. The stretch files allow for a very sweet sounding tuning.

      (0 of 3 customers found this review helpful)


      It is not a best buy

      By SeaCloud

      from California

      See all my reviews

      Comments about Peterson 490-ST AutoStrobe Tuner with Stretch Tuning:

      I bought this for tunning my piano, the auto detecting does not work well, it gives me wrong note even I test against my Yamaha digital piano.Manu mode is good if I use external microphone, but it does not work on extreme frequence.

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