Maybe try one from Sanwu---they actually test and meter the output + they get them from one of the better suppliers.
see: https://www.sanwulasers.com/product/304
Sanwu says on homepage re: coronavirus lockdowns in China: Feb, 13, 2020
New order shipping will be delayed until further notice(manufacturing suspend by China government due to coronavirus)
Expected Date on Resume to work: March 1
532nm 303's are a wonderful starting laser. I would really suggest contacting the seller and telling them it is defective. I had a problem with my first 303 types and they sent me two more for free lol