Harley Benton CM-1000

Viene fornito come elemento di input per un accordatore esterno.
Io l'ho comperato per esperimento... per testare la qualità della capsula microfonica per rilevare il segnale da uno strumento acustico - contrabbasso - da inviare poi su un amplificatore, in sostanza una specie di pick-up di scorta.
Il posizionamento, nel mio caso è sul ponte, tra il centro dell'arco inferiore e il piede corrispondente alle corde gravi, ovviamente con interpizione di un preamplificatore attivo per questioni di impedenze.
Il risultato è stato conforme alle aspettative... la qualità non è eccezionale, in particolare ho potuto osservare una scarsa presenza di armoniche basse e di conseguenza la mancanza di precisione nell'amplificazione al di sotto dei 50 Hz, in aggiunta a sonorità oggettivamente troppo "legnose" e "vuote", che però possono essere corrette modificando i parametri di preamplificazione.
Tuttavia ho potuto verificare che l'installazione è semplicissima e affidabile, e considerando il costo estremamente basso, con le dovute cautele esso può effettivamente essere utilizzato anche nella configurazione descritta, risultando evidentemente il pick-up più economico in assoluto.

I got this for tuning acoustic instruments.

It's cheap and in theory it's a useful product to have in a studio. Unfortunately the cable is far too short for any permanent connection so you'll need to re-attach it every time you need tuning.

Build quality is almost unbelievably poor. It's so fragile that I was actually worried every time someone used it. I packed it carefully away each time to avoid breaking it. Too much hassle for something that WILL break, sooner rather than later. I know it may seem a bit harsh to criticize build quality when it hasn't actuall broken yet but trust me, this is as cheap and fragile as it gets. Any more fragile than this and it would have fallen apart before you even open the box.

There are better ways to tune an acoustic instrument. Simply using the "clamp a pair of headphones around the guitar"-trick and plug it into a tuner works just as good. Or use a tuner with a built in mic instead. Or simply tune by ear, which is often both faster and better.

It may seem like a useful product but it's actually not that great and soon turns out to be redundant, especially if you already own a tuner with a mic (and if you don't you probably won't need this one either!).

I still keep it around, carefully packed and stored in a drawer for those extremely rare situation when someone needs tuning an acoustic instrument where the headphone-trick can't be used due to physical limitations and tuning by mic or ear for some reason isn't ideal (like lots of background noise).

I guess it fills a VERY small niche in my studio but it's not something I really NEED and I wish the build quality could have been just a little bit better and the cable a bit longer. Then it could have been a more useful tool.

Finally, in case anyone wonders: No it's not suitable for recording. It's not meant for this and the sound quality is awful. Maybe for triggering something... but still far too fragile to be trusted except for very occasional CAREFUL use.

Could be better but it's great for the price.
Cons (1): If the cable isn't completely still it can pick up a lot of motion noise if your trying to use this piezo in multiple ways, not only for tuning.
Cons (2): The clip-on mechanism could be a little more flexible or open a little more, but it will serve most use cases.
Pros (1): Decent quality.
Pros (2): Great price.