Thermco's Plastic Hydrometers: Durable Polycarbonate Construction: These hydrometers are crafted from polycarbonate (PC), ensuring they are shatter-proof while providing exceptional clarity similar to glass, making reading measurements effortless. Multiple Measurement Scales: Designed for versatility, these hydrometers cover a range of measurement scales, including Specific Gravity, Salt-Brine, Baume, and Sugar Brix, making them suitable for various applications. Plain Form: All models are in plain form, indicating that a separate thermometer should be used to measure the sample's temperature. This allows for accurate corrections due to temperature variations. Calibrated Against NIST Standards: Each hydrometer is calibrated against NIST (National Institute of Standards and Technology) standards, ensuring accuracy and reliability in your measurements.Certifiable and Traceable: These plastic hydrometers may be certified and are traceable to NIST, providing confidence in the accuracy of your measurements.Thermco's Plastic Hydrometers are the perfect choice for a wide range of applications, offering durability, clarity, and accurate measurements across various scales.