Best Upgradable Sharpener Hapstone R2

Best Upgradable Sharpener: Built atop a set of rubber-coated supporting legs, the Hapstone R2 Standard is a modular base system that features a 360° rotating pivot unit with an integrated parking hook for the guide rod, linear ball bearings, and an auto-adjustable universal stone holder. While not sold with any included stones or accessories as standard, what makes this tabletop sharpening system so impressive — on top of it being capable of sharpening blades up to 12” in length and up to a whopping 0.35” in thickness —  is the enormous number of available add-ons, upgrades, models, and stones that the Ukrainian company offers for the R2 Standard. Sold in sets of five or six, this bench top system is offered with 11 different optional stone sets including Boride stones, silicon carbide stones, aluminum oxide stones, diamond stones, and CBN stones. Optional add-ons for the system include a fine-tuning adapter, an LED lighting system, a digital angle gauge, a scissors module, and a digital blade edge microscope with a 4.3” LCD display.