Store fragile glass hydrometers safely with this 18-place polypropylene rack. It features 25 mm diameter holes in the middle and top plates, while the bottom plate, standing 44 mm high, has tapered wells (25 mm to 9 mm) to secure the hydrometer bulb. The 210 x 216 mm base ensures stability, and the rack has an overall height of 251 mm, including handles. Steam autoclavable at 121°C for easy sterilization.