# Hydrometer Temperature Adjustment Calculator The Hydrometer Temperature Adjustment Calculator allows you to adjust hydrometer readings based on the temperature of the sample. Liquids expand and contract at different temperatures, meaning the liquid can become more or less dense. Hydrometer readings are based on the gravity of the liquid which is directly affected by the density of the liquid, and thus can be incorrect depending on the temperature the hydrometer was calibrated at, and the temperature at which the measurement was taken. A simple formula is used to allow for compensation at different temperatures. **To make a measurement adjustment** 1. Select your measurement unit (standard gravity, brix) 2. Enter the hydrometer reading 3. Enter the measurement temperature 4. Enter the original calibration temperature 5. Optionally provide an offset if you have performed a custom calibration 6. The adjusted value will be calculated **NOTE**: The RAPT Pill Hydrometer and Thermometer measuires Specific Gravity by angle. It is not affected by temperature i the same manner as a traditional glass tube tpye of floating hydrometer - thus, this calculator is not accurate for the Pill --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.rapt.io/tools/hydrometer-temperature-adjustment-calculator.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.