ZOHO BOOKS and Zoho inventory for small shop

ZOHO BOOKS and Zoho inventory for small shop

I'm new to ZOHO BOOKS and  have confusion.
Suppose I'm small trader/shop keeper with 5 items which I purchase from vendor and sell it. 

Zoho books seems but for stock do I need ZOHO Inventory ??? 
in stock particularly I need what value and quantity stock is with me (no online sales, no shipping tracking)

Plz clarify

Regards
Bk Kalia