Hi friends!

I am in search of a small Morse Code trainer/electronic meter small enough to fit in my pocket, and has the following features:

• Speed selectable
• Works with an iambic key, and is Type B selectable
• Has a key jack for an external keyer
• Polarity selection, I key southpaw.
• Headphone jack

Bonus:

• Can adjust tone pitch down to 44Hz

Google turns up a few things here and there, I’d just like to see if any of y’all have any immediate recommendations.

Thank you!