Experience precision like never before with the ROBINSON API Combined Hydrometer, a dual‑function thermohydrometer engineered for oil testing accuracy. At 15 inches long, this instrument delivers dependable readings across a API gravity range of 50 to 70 in 0.1 divisions, with a temperature range of 0–150°F. Built to meet strict API testing standards, it pairs reliability with practical convenience for the lab or field.
 Key Features
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Precision Grade Design: Calibrated to the API scale Modulus 141.5 at 60°F for consistently accurate measurements.
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Solid Alloy Ballast: Engineered for quick penetration to the setting point, minimizing air bubbles for stable readings.
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Built‑in Thermometer: A thermometer located at the bottom allows you to monitor temperature while testing, eliminating extra steps.
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Certification Options: Available upon request with documentation that includes three‑point corrections on the gravity scale, ensuring reliability and auditability.
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NIST‑Aligned Confidence: Certifications cover three gravity points, supporting rigorous standards and traceability.
 
 Why settle for less when you can rely on a tool that combines precise density measurements with real‑time temperature data? The ROBINSON Hydrometer is designed to streamline workflows, reduce testing time, and deliver results you can trust in oil analysis, quality control, and research environments.
 Use Cases
 - Laboratories conducting oil density testing with tight accuracy requirements.
  - Quality assurance teams needing reliable, on‑site measurements for liquid products.
  - Research facilities requiring dependable thermohydrometer data for experimental work.
 
 With ROBINSON, you gain a dependable instrument backed by a legacy of precision and industry‑standard certifications, making it an essential addition to any high‑performance measurement toolkit. 
 Note: The hydrometer is designed to meet API oil testing specifications, and its built‑in thermometer enables simultaneous temperature monitoring to support accurate density readings.