TekcoPlus Salinity Refractometer ATC 0-28%, 0-280 PPT of NaCl, Measuring Sodium Chloride in Food, Salt, Seawater, Soy Sauce, Brine 0.2% Division, Made of Aluminum, with LED Light and Pipettes auspowers_batchone It has a hub attached

It has a hub attached and the inside diameter is 3/4''

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TekcoPlus Salinity Refractometer ATC 0-28%, 0-280 PPT of NaCl, Measuring Sodium Chloride in Food, Salt, Seawater, Soy Sauce, Brine 0.2% Division, Made of Aluminum, with LED Light and Pipettes auspowers_batchone It has a hub attachedTekcoPlus Salinity Refractometer ATC 0 28%, 0 280 PPT of NaCl, Measuring Sodium Chloride in Food, Salt, Seawater, Soy Sauce, Brine 0. 2% Division, Made of Aluminum, with LED Light and Pipettes Read more Read more Read more Measuring Range: 0 to 28%Division: 0. 2%Accuracy: 0. 2%Reference Temperature: 20CATC : 10 30CItem Length: 17. 2 cmItem weight: 99gShipping size: 21 x 9 x 6 (cm) Set Includes 1 x Traditional Salinity Refractometer 1 x English