तस्यापिहितकाचकस्योदके निमज्जत एकदेशः सीदति पटलान्तरेषु वा सूच्या भिद्यते ॥ ॥
tasyāpihitakācakasya udake nimajjata ekadeśaḥ sīdati paṭalāntareṣu vā sūcyā bhidyate
对于用玻璃盖封住的该物:浸入水中时,有一部分会下沉;或在层与层之间用针刺穿(以检验)。
They are quick, low-cost, and reproducible—ideal for routine enforcement by inspectors without specialized equipment.