Feature●Provides precise readings of upward interfacial and surface tensions by the ring method to values reproducible within 0.05 dyne/cm●Range 0 to 90 dynes per centimeter●Graduated dial reads in both directions from zero; double Vernier●Easy handling●EfficientDescription Provides precise readings of upward interfacial and surface tensions by the ring method to values reproducible within 0.05 dyne/cm, Range 0 to 90 dynes per centimeter, Graduated dial reads in both directions from zero; double vernier,8:8Easy handling, Efficient.