Go take a look at the links below from MOM website:
S Pass
(minimum salary > $1, 800)
http://www.mom.gov.sg/publish/momportal/en/communities/work_pass/s_pass.html
Employment Pass
P1 - salary > $7,000
P2 - salary > $3,500
Q1 - salary > $7,000
http://www.mom.gov.sg/publish/momportal/en/communities/work_pass/employment_pass/about_the_pass.html
The only employment pass that remains ambiguous is the Work Permit (Foreign Worker) and the Work Permit (Foreign Domestic Worker). These are your laborers, construction workers and maids.
http://www.mom.gov.sg/publish/momportal/en/communities/work_pass/work_permit.html
http://www.mom.gov.sg/publish/momportal/en/communities/work_pass/foreign_domestic_workers.html
S Pass
(minimum salary > $1, 800)
http://www.mom.gov.sg/publish/momportal/en/communities/work_pass/s_pass.html
Employment Pass
P1 - salary > $7,000
P2 - salary > $3,500
Q1 - salary > $7,000
http://www.mom.gov.sg/publish/momportal/en/communities/work_pass/employment_pass/about_the_pass.html
The only employment pass that remains ambiguous is the Work Permit (Foreign Worker) and the Work Permit (Foreign Domestic Worker). These are your laborers, construction workers and maids.
http://www.mom.gov.sg/publish/momportal/en/communities/work_pass/work_permit.html
http://www.mom.gov.sg/publish/momportal/en/communities/work_pass/foreign_domestic_workers.html