Check the listing for details. Mud Scale Liquid Mud Hydrometer Densimeter Hydrometer Mud Gravity Balance. Condition: New, Made in Unknown. Listed at 75.21 USD. Description Our mud hydrometer is made of high-quality stainless steel and aluminum alloy, which are very tough and durable. This scale has dual-scale units that allow you to switch units easily. The chemically etched scale markings are very clear, making your readings unobstructed. It is very easy and convenient to use. This mud hydrometer will be a great helper in your work. Key Features Clear Scale: The scale of this ruler is chemically etched so that each scale is recessed. This makes the scale clearer and more distinct. It is more accurate to see when using it. Accurate Measurement: The smallest measuring range of this ruler is 0.01 g/cm³and 0.1 lb/gal. This allows for accurate enough measurement of liquids.