Hydrometer and Float Test CupHydrometer and Float Cup combination. Use this hydrometer test cup and hydrometer (8" - items 17284335 and 17284373) to test the sugar content of maple syrup. Made from durable stainless steel. Finger loop keeps your hands safe when working with hot syrup. Use with hydrometer to measure the sugar and moisture content of boiled sap Durable stainless steel construction Measures 8 in. tall, 1 in. diameter Finger loop handle keeps your hands safe when working with hot syrup Hydrometer. / Densimeter - 35-75 brix Syrup Scale, 230mm model, use 8" cup. Calibrated to be accurate at a syrup temperature of 211 F hot syrup and 62 F cold syrup. There is a conversion chart included if your temperature falls between these two measurement temperatures. A hydrometer is used to measure the percentage of sugar and density of maple syrup at a specific temperature. To be considered maple syrup, thesap must be evaporated until it reaches a specific density. A hydrometer is the easiest way to accurately measure the density of your syrup. A must-have for any maple syrup maker!