Jena

Marsoni

M251S

$162.50

Get it in 3 business days with 1 day shipping. Friday, May 29

JenaJena is a digital module that may be used as a flexible waveshaper for CV and audio signals, a wavetable oscillator, a Walsh function generator, or a rhythm generator. Jena is a new member of the Leibniz Binary Subsystem which operates on signals and volt ages by manipulating binary 8 bit numbers. The Leibniz subsystem offers direct access to all individual bits of data which can be mixed and cross patched (like in the popular circuit bending

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I bought this to use primarily as a travel grinder and found that it is great for every day use. It is not meant for large amounts but it is perfect for single, smaller brewing situations. The grind selection worked well and I "dialed" the proper ground size for my single sized pour over coffee maker.

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Reviewed in the United States on May 19, 2026

Verified Purchase

Karin Conover-Lewis

Carnegie, US

★★★★★ 1

Ceramic burr destroyed itself

Color: Silver

For the first two-plus months it worked fine -- the perfect grind and the perfect amount with a full barrel for my oversized coffee mug. I've been using it once daily, more or less, on a medium grind setting of 25, and this morning the ceramic burr started to eat itself. This is not acceptable. Follow up: Circle Joy contacted me and offered to give a full refund on this purchase, which was gratefully accepted. This is outstanding customer service.

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Reviewed in the United States on April 28, 2026

Verified Purchase

Brian

Chelsea, US

★★★★★ 5

Best price for better tasting coffee

Color: Silver

I am a coffee snob. I only get beans. I have been using a magic bullet blender to grind, which actually does extremely well, but the grind wasn't quite even enough. So I found the cheapest, ok quality grinder I could and bought this one. I absolutely love it. It take a while to grind, and it only does a little at once, but whatever. This thing works great and my grounds are now even. The burrs seem to be of decent quality and the whole device works smoothly.

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Reviewed in the United States on February 18, 2026

Verified Purchase

pjp

Phoenix, US

★★★★★ 5

Wonderful grinder:

Color: Silver

This is one little powerful grinder. It holds 30 grams in the glass jar which is perfect for 2 cup 10oz cups. It has a dial to adjust the grind. Great for two! It works great. Really good purchase. It is a labor of love. l

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Reviewed in the United States on May 29, 2026