Protect fragile hydrometers and lactometers by storing them in this 18-place polypropylene rack. The middle and top plates have 1” diameter holes; the bottom plate is 1 3/4” high and has wells tapering from 1” to 3/8” to hold the hydrometer bulb. Base is 8 1/4” X 8 1/2”; height is 9 7/8”. Steam autoclavable at 250° F.