HSK 5
Wǒ gěi sùshè mǎi le gè xiǎo zhēngdànqì.
I bought a little egg steamer for my dorm.
HSK 6
Zhēngdànqì zǎoshang zhǔ dàn hěn fāngbiàn.
An egg steamer is really convenient for cooking eggs in the morning.
HSK 7-9
Zhè kuǎn zhēngdànqì yī cì néng zhēng qī gè dàn.
This egg steamer can do seven eggs at a time.