MANILA - Precinct count optical scan (PCOS) machines to be used in the May 2013 elections will be subjected to further tests, the Commission on Elections said Friday.

Comelec Chairman Sixto Brillantes said the poll body is now going into the logic and accuracy test of the PCOS machines.

He said he will take media to the Comelec's warehouse in Cabuyao, Laguna on April 5 to show the preparations being done on the PCOS machines. The poll body has added a night shift in the preparation of the machines.

Brillantes said the warehouse is a secure facility. He last visited the warehouse Thursday night.

A total of 77,829 PCOS machines will be deployed for the May 13, 2013 elections, with each clustered precinct getting its own PCOS machine.

Comelec purchased 80,916 PCOS units from smartmatic.

The National Printing Office has printed 42 million ballots as of today, with 10 million ballots remaining before hitting the target of a little over 52 million ballots for the 52 million registered voters on election day.