ASTM E337

ASTM E337 is the standard test method for measuring humidity with a psychrometer, focusing on the measurement of wet-bulb and dry-bulb temperatures. It provides a recognized technical basis for assessing ambient moisture conditions using psychrometric principles. This matters because humidity readings can affect laboratory work, environmental monitoring, and other controlled processes where reliable atmospheric measurements support better decisions and more consistent results.

Purpose of ASTM E337

The purpose of ASTM E337 is to guide the measurement of humidity through psychrometer-based temperature readings. By defining a standardized approach to wet-bulb and dry-bulb temperature measurement, the method helps users generate results that are more consistent and easier to compare. The standard is useful where humidity control, verification, or documentation depends on a repeatable test method rather than informal observation or uncalibrated practice.

Common use cases of ASTM E337

ASTM E337 is commonly used in settings where humidity measurement is part of routine testing, environmental checks, or equipment verification. It may be applied in laboratories, controlled spaces, and general technical environments that rely on psychrometers to assess air conditions. The standard is also relevant for quality-focused workflows where wet-bulb and dry-bulb temperature data are used to support humidity calculations, records, or compliance-related evaluation.

Why ASTM E337 matters

This standard matters because humidity measurements can influence test outcomes, storage conditions, and process consistency. Using ASTM E337 helps organizations align measurement practice with a recognized ASTM standard, supporting more dependable results and reducing ambiguity in reporting. For procurement, quality control, and technical documentation, a clearly defined method can improve confidence in the data and make it easier to compare results across teams or facilities.

• Psychrometer-based humidity measurement
• Wet-bulb and dry-bulb temperature readings
• Consistent test method for comparison
• Useful for controlled environmental checks