On August 09 I was granted a 6 month METV. On September 12 I entered Thailand by air and was stamped for 60 days. On the 60th day I left and am now in the Philippines. When I return to Thailand, I can use the same visa? I will be stamped for 60 days?
TLDR : Answer Summary
You can use your 6-month METV for another entry to Thailand as long as you enter before the visa's expiration date. When you return, you will receive a new 60-day tourist stamp. Additionally, upon entering, you can also apply for a 30-day extension of stay.