How Construction Workers Choose Biometric Time Attendance Access Control Machine?

1）Fingerprint time attendance machines?

2)Facial Recognition machines?

3)RFID card machines?

4)Iris recognition Machines?

Why not  option 1 to be best choice?

A) As everyone knows, workers who work in construction site, fingerprint textures may not be so good for a Fingerprint machine. Most times, the machines may fail to read or will take many times to recognize;

B) As well, sometimes, when workers work off, their fingerprint may get dirty, it will also make fingerprint sensor hard to recognize.

Why not option 3 to be best choice?

A) Easy to get lost

B)Easy to do fake time attendance with other staff.

Why not option 4 to be Best Chose?

A)Not user friendly, as IRIS recognition will require your two eyes get close to the camera

B)Cost higher than facial Recognition

Best Biometric Time attendance Machine for Construction workers should be Facial recognition machines.