Sushruta Samhita
समाहितानि यन्त्राणि खरश्लक्ष्णमुखानि च । सुदृढानि सुरूपाणि सुग्रहाणि च कारयेत् ॥९॥
"The instruments should be well-designed, with a strong and appropriate structure, having clear and accurate features, and should be easy to handle."
english translation
samAhitAni yantrANi kharazlakSNamukhAni ca । sudRDhAni surUpANi sugrahANi ca kArayet ॥9॥
hk transliteration by Sanscript