How do I know what size tamper to buy?

Accurately measured, the coffee tamper’s inner diameter should be smaller than the inner diameter of the basket. So you can equitably smaller the ground espresso. The best technique to recognize the right alter size is to quantify the specific inside size of your basket utilizing mechanical engineer calipers. If you don’t approach a bunch of calipers, you can likewise utilize a steel estimating tape with 1/32″ divisions and an extremely cautious eye and consistent hand to take the estimation and afterward convert it to millimeters.

And the easiest way to choose the right size tamper is refer here below table, according to the brand to choose right size.

Automatic Coffee Tamper Size Reference Chart

Automatic Tamper Size Reference Chart
Coffee Machine Brand Portafilter Diameter(mm) Coffee Machine Brand Portafilter Diameter(mm)
Ascaso 57mm La Marzocco 58.3mm
Astoria 58mm La Pavoni 56mm
Astra 56mm La Pavoni Duet, Club, Napolitana 57mm
Aurora 56mm La Pavoni Europiccola 49mm
Bezzera 58mm La Pavoni Lever (Millenium New Lever) 51mm
Bodum Granos 51mm La Pavoni Lever (older Pre 2000) 49mm
Brasilia 58mm La Pavoni Lusso, Pisa, Si 53mm
Bunn 58mm La Scala 58mm
Caramali 58.3mm Mokita 55mm
Cimbali 58mm Nuova Simonelli 58mm
Conti 58mm Olympia Express 49mm
Dallacorte 54mm Pasquini 58mm
Delonghi (old) 49mm Pasquini Livia 58mm
ECM 58mm Quickmill 58mm
ECM Botticelli 58mm Rancillio 58mm
ECM Giotto/Cellini 58mm Reneka 56mm
Elektra 58mm Riviera 43mm
Estro 53mm Rocket 58mm
Expobar 58mm San Marco 54.3mm
Faema 58mm Solis 53mm or 52mm
Faema Family 53mm Spaziale 53mm
Fiorenzato 58mm Starbuck’s (Barista) 53mm or 52mm
Futurmat 58mm Synesso 58.3mm
Gaggia 58mm Saeco 53mm
Grimac 58mm Unic 57mm
Innova 57mm VST 58.3mm
Isomac 58mm VFA 58mm
Krups 49mm Wega 58mm