The Peterson JMI ("Just Major Intonation") temperament is a blessing for diatonic autoharps (37 strings). You also have to set the the base or fundamental for the scale it is using to match the preferred key of your instrument. If you're playing with others, you need to set an absolute frequency, e.g. A = 440, as well.

I never take my Peterson out for banjo -- in spite of it being one of the coolest (albeit pricey) gadgets in the world. Harmonics on the open strings (e.g., at the 5th, 7th, 12th, and 4th frets) give me the frequency ratios I want where I want them, i.e., on open strings. That not only goes for double-C but also for "Last Chance" fCFCD, of which I've recently become enamored.

The Peterson is great and I've become quite fond of unitune as well. Both are very accurate. The Peterson is a compact version of the oscilloscope tuners used in better studios.

I've had two of the Stroboclips. The first one ate batteries like popcorn. I gave it to somebody. The rechargeable version I've had for the past 5-7 yrs is very nice...and I may recharge it twice a year.

I often use it for OT tunings. I never use the sweetening features. Frankly, I couldn't hear the differences.

I am a fan and a user of Peterson clip on strobe tuners...main thing for me is that they are visible even in challenging light conditions...all I really need to see is movement...or lack thereof...not colors...tho for my wife's fiddle I do use a "colored" tuner...but only because it has a clamp that actually fits a fiddle scroll...so it is easy to put on and take off...and it provides a very solid connection

I can’t help but wonder how much of the difference is the timer and how much is the clip. I’ve never felt good about snarks, but this one even works on my fiddle scroll without having to spring for that added clamp. But yeah, it’s certainly easier to see, too.

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Originally posted by trapdoor2

I've had two of the Stroboclips. The first one ate batteries like popcorn. I gave it to somebody. The rechargeable version I've had for the past 5-7 yrs is very nice...and I may recharge it twice a year.

I often use it for OT tunings. I never use the sweetening features. Frankly, I couldn't hear the differences.

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I've had a few Peterson clip-on tuners from a few generations, and while I find them very accurate, I've had a few problems with them. I had a middle-generation StroboClip that came out a while ago, and mine too ate batteries like popcorn, dying just when I needed it most. But I tried to always keep a few new CR2032 cells in my case. Then a month or so after the warranty ran out, it just stopped working, showing random displays, but not registering the strings plucked. I fussed with it a while, but to no avail. So I thought, "Peterson seems like a reputable company whose products are used by professionals, so they probably provide reasonable service." So I looked up their repair policies - which said they'd repair any of their tuners for a flat fee of $70. Well, that tuner sold for $69.95 (and as an early purchaser, I got it for something around $45)! Gee, such a deal! So I tried other tuners, but none were as good, so recently I picked up the current rechargeable version of the Peterson StroboClip ($80!) and it seems to work well, but recently, twice when it needed the charge topped up, I plugged it in, and when I next turned it on, it was completely discharged and wouldn't even turn on! Grrr.