Sharknative open data: maker-published spec tables for countertop appliances, castable sonar, office espresso machines, first 3D printers and small-space fitness gear

Open CC BY 4.0 spec tables behind five product-research tools. Each table holds maker-published specifications with a source URL per cell; cells with no published figure are left blank. Every dataset folder has the CSV, the JSON and a README with the source page, the gathering method and a citation line. The canonical, latest copy of each table lives on its page: Countertop appliance heights and cabinet clearances (CounterTopCheck) Castable Sonar Spec Index (AnglerLeague) Office espresso machine data (CremaCheck) First-printer data (FirstPrintCheck) Small-Space Fitness Index (Wellness Rundown)