Profile: Brady Instruments is a manufacturer of industrial hydrometers, thermometers, and custom glass instruments. All our instruments are constructed with non-toxic materials and packed in crystal clear plastic tubes. These tubes can also be used as test jars when used in conjunction with the Model #170 foam donut. Most instruments include instructions for use. Model 152 triple scale hydrometer is a full color hydrometer. This hydrometer incorporates our rugged design with an easy-to-read scale. Non toxic construction, oversized sample tube, and accuracy make this an ideal triple scale hydrometer.