तस्यापिहितकाचकस्योदके निमज्जत एकदेशः सीदति पटलान्तरेषु वा सूच्या भिद्यते ॥ ॥
tasyāpihitakācakasya udake nimajjata ekadeśaḥ sīdati paṭalāntareṣu vā sūcyā bhidyate
وأمّا ذلك الشيء المختوم بغطاءٍ زجاجي: فإذا غُمِس في الماء غاص جزءٌ منه؛ أو يُثقب بين الطبقات بإبرة (للاختبار).
They are quick, low-cost, and reproducible—ideal for routine enforcement by inspectors without specialized equipment.