My husband had a vasectomy 2 years ago. can i test his sperm somehow at home to see if it's capable of producing children?

No: The idea of a vasectomy is to block the sperm. Usually men are tested to ensure there are no sperm in the ejaculate. If you want sperm you may need to consider a reversal procedure. There is no reliable way to check for sperm at home and based on the fact he has had a vasectomy, he shouldn't have any. He can produce a sample of his ejaculate and have it examined by a lab specialist. All the best.