H-B DURAC B61800-1000 Salt Brine Shatterproof Plastic Hydrometer; 4/26.4 Percent by Weight Made from optical quality polycarbonate plastic material; durable and shatterproof; perfect for field work where breakage could be a concern Used for measuring sodium chloride saturation of salt brines in industries including food, fishing, and transportation; Range: 4/26.5% Easy to read black scale on yellow back helps avoid eye fatigue Individually serialized; lead free ballast Packaged with a multi-language (English, French, German, Italian, Portuguese, and Spanish) Statement of Accuracy indicating accuracy traceable to NIST; Former HB #4935