Tone of "hello" in Thai

Hi folks,

Just started learning Thai. Can someone please explain what is the tone of ครับ (khrab) and คะ (ka)?

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• สวัสดี คะ - sa (low) wat (high) dee (mid)
  

คะ should be low tone (mid consonant + short vowel)

I'm not sure about ครับ. The videos I found seem to pronounce it in rising tone?In some videos the rising tone and high tone seems interchangable?

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** Thanks everyone for the great lesson!