Sushruta Samhita
एतैर्दोषैर्विनिर्मुक्तं यन्त्रमष्टादशाङ्गुलम् । प्रशस्तं भिषजा ज्ञेयं तद्धि कर्मसु योजयेत् ॥२०॥
The instrument free from these defects, measuring eighteen finger-breadths, should be known as excellent by physicians and should be employed in surgical procedures.
english translation
etairdoSairvinirmuktaM yantramaSTAdazAGgulam । prazastaM bhiSajA jJeyaM taddhi karmasu yojayet ॥20॥
hk transliteration by Sanscript