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at 9:44 pm on Mar 19, 2012
https://www.google.com.sg/search?tbm=isch&hl=en&source=hp&biw=1366&bih=651&q=ph+chart&gbv=2&oq=ph+&aq=2&aqi=g10&aql=&gs_sm=1&gs_upl=2374l2374l0l4793l1l1l0l0l0l0l141l141l0.1l1l0&gs_l=img.1.2.0l10.2374l2374l0l4793l1l1l0l0l0l0l141l141l0j1l1l0.frgbld.#hl=en&safe=active&gbv=2&tbm=isch&sa=1&q=ph+chart&oq=ph+chart&aq=f&aqi=g10&aql=&gs_sm=3&gs_upl=29845l32604l0l33934l8l8l0l1l1l0l167l960l1.6l7l0&gs_l=img.3..0l10.29845l32604l0l33934l8l8l0l1l1l0l167l960l1j6l7l0.frgbld.&bav=on.2,or.r_gc.r_pw.r_qf.,cf.osb&fp=a33bd3c38351abc3&biw=1366&bih=651
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1E1_2012 Group 5 said
at 9:44 pm on Mar 19, 2012
https://www.google.com.sg/search?tbm=isch&hl=en&source=hp&biw=1366&bih=651&q=ph+chart&gbv=2&oq=ph+&aq=2&aqi=g10&aql=&gs_sm=1&gs_upl=2374l2374l0l4793l1l1l0l0l0l0l141l141l0.1l1l0&gs_l=img.1.2.0l10.2374l2374l0l4793l1l1l0l0l0l0l141l141l0j1l1l0.frgbld.#hl=en&safe=active&gbv=2&tbm=isch&sa=1&q=ph+chart&oq=ph+chart&aq=f&aqi=g10&aql=&gs_sm=3&gs_upl=29845l32604l0l33934l8l8l0l1l1l0l167l960l1.6l7l0&gs_l=img.3..0l10.29845l32604l0l33934l8l8l0l1l1l0l167l960l1j6l7l0.frgbld.&bav=on.2,or.r_gc.r_pw.r_qf.,cf.osb&fp=a33bd3c38351abc3&biw=1366&bih=651
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