This product is for business contractors. *The glass tube eyedropper absorbs sample fluid and measures the specific gravity in the liquid in the tube, making it convenient for use in the site. Specific Gravity Range: 0.940 - 1.000; Scale: 0.002; Total Length: Hydrometer: 6.3 inches (160 mm); *Please use 63-1461-10 extra-large eyedropper.