Available on Request Thimson Thimson Water Acidity Testing Hydrometer, 1100-1300 Level Hydrometers (density meters) measure the specific gravity of liquids. Specific gravity is the ratio of the density of the liquid being tested to the density of water. Accurate level1100 - 1300 Level Available on Request Quick view Qty in Cart: 0 Price: Out of Stock Subtotal: Available on Request