As far as handheld refractometers go

The secret to its performance lies in the laser-cut holes

The ThermoJet in the Bambino BES450BSS goes beyond making fast coffees while being energy efficient -- it also gives the steam wand amazing power

Phone-Based Particle Analysis - Photograph a sample through the CoffeeOS app and get a full size distribution without extra hardware

Add your capsule to the capsule chamber

Fellow Espresso Guided Tamper Cinoart As far as handheld refractometersThe Fellow Espresso Guided Tamper is a spring loaded, self levelling espresso tamper designed to help produce more consistent tamping with less guesswork. Compatible with 58mm single wall double baskets, it applies even pressure while a built in volumetric guide provides visual feedback, helping improve puck preparation and promote more balanced extractions. Built from aluminium and stainless steel, the Guided Tamper is designed for repeatable daily