Я пробил товар на кассе самообслуживания и сохранил чек.

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Breakdown of Я пробил товар на кассе самообслуживания и сохранил чек.

• на: at
• и: and
• товар: the item

Questions & Answers about Я пробил товар на кассе самообслуживания и сохранил чек.

Why is it пробил (past masculine) and not пробила / пробило / пробили?

Russian past tense agrees with the speaker’s gender/number:

• Я пробил = a male speaker
• Я пробила = a female speaker
• Я пробило would only be for neuter (not used for people)
• Я пробили = “we” or plural subjects
  Same pattern with the second verb: сохранил / сохранила.

What does пробить товар mean here? I thought пробить means “to punch through.”

Literally пробить can mean “to pierce/punch through,” but in shopping/cashier context it’s a very common colloquial verb meaning to ring up / scan items at the register (i.e., process them so they appear on the bill).
So пробил товар на кассе = “I rang up/scanned the items at the checkout.”

Why is товар singular—does it mean one item?

Not necessarily. Товар often works like an uncountable/collective noun meaning “goods/merchandise/your shopping.”
If you want to emphasize multiple distinct items, you can also say:

• пробил товары (less common in everyday “my groceries” context)
• пробил все товары / все покупки (very natural)

Why is it на кассе and not ?