Identification Cards are often the solution for larger companies where security guards can be posted at entrances to check ID cards. PIN access lists should be updated regularly to ensure previous employees do not continue to have access to business information. Smart cards are physical identification tags, often called tokens, which are carried around with employees for identification. Fingerprint and Handprint scanners are the cheapest biometric scanners to implement and are very successful as identifying someone based on their unique finger print. Biometric scanners are more expensive measures of authentication, which use an employee’s physical characteristics to gain access.”]
Source: https://www.govinfosecurity.com/id-access-management-basics-physical-security-a-780