An official website of the United States government. Here's how you knowHere's how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Latest Earthquake | Chat Share
The HIF evaluates equipment and instruments in an effort to ensure that these devices will meet the requirements of the USGS for hydrologic data collection. These requirements include accuracy, performance under a wide range of environmental conditions, and cost effectiveness.
Equipment and instruments selected for evaluation must meet at least one of the following criteria:
Equipment and instrument evaluations usually involve testing in environmental chambers or at field sites. Evaluations are usually conducted following test plans that allow for observation of the performance of the device over most, if not all, of its stated temperature range. For devices that measure a specific quantity (for example pressure or specific conductance), the test plan also will provide for exposing the device to a significant portion of, if not the entire, stated range of measurement for the quantity being measured. This document provides guidance for selecting and conducting evaluatoins of hydrologic instruments and equipment.
Last updated August 2018.
Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.