Psychrometer Calibration Services

Micro Precision is an ISO/IEC 17025:2017 accredited calibration provider delivering NIST-traceable psychrometer calibration services through a network of more than 50 labs. Quality managers, compliance officers, and procurement teams across agriculture, food and beverage, HVAC, and industrial manufacturing rely on Micro Precision to keep sling, aspirated, and digital psychrometers within their required accuracy standards. Micro Precision calibrates a variety of humidity and temperature instrument brands, including Extech, Testo, and Vaisala, giving procurement teams a single vendor for an entire environmental monitoring fleet.

Psychrometer calibration is closely related to, but distinct from, Humidity Calibration Services: a psychrometer derives relative humidity from paired wet-bulb and dry-bulb temperature readings, while humidity transmitters and chart recorders measure relative humidity directly.

Psychrometer calibration matters because an uncalibrated instrument can silently drift out of tolerance, producing incorrect wet-bulb and dry-bulb readings, and therefore incorrect relative humidity, without any visible warning. ANSI/NCSL Z540.3 establishes the calibration program requirements that quality systems depend on, and uncalibrated psychrometers introduce real operational risk:

• Product and Crop Loss: Inaccurate humidity readings derived from a miscalibrated psychrometer can allow crops, food products, or stored materials outside safe conditions to go undetected, risking spoilage or quality loss.
• Regulatory Non-Compliance: Food safety, agricultural, and industrial quality systems require documented, traceable calibration records for humidity-monitoring instruments used in regulated processes.
• Process and Comfort Failures: Inaccurate readings can mask HVAC or environmental control conditions that affect product quality, equipment performance, or occupant comfort.
• Audit Findings: Missing or undocumented calibration records are a common source of corrective action findings during regulatory and customer audits.

Quality managers need a documented, traceable calibration history to pass ISO/IEC 17025:2017 and customer audits without corrective action findings. Micro Precision’s calibration program addresses these risks directly, applying ANSI/NCSL Z540.3 program discipline to every psychrometer it services.

Ensuring accurate psychrometer calibration means comparing the instrument’s wet-bulb and dry-bulb readings against NIST-traceable reference standards under controlled conditions. Micro Precision follows a defined sequence for every psychrometer received: inspect the instrument, place it alongside certified reference standards under stable environmental conditions, record and compare wet-bulb and dry-bulb readings at multiple points, adjust or flag the instrument where needed, and issue documentation confirming the outcome. Micro Precision offers standard turnaround alongside faster turnaround options for psychrometers on a tight compliance or production schedule.

Micro Precision calibrates psychrometers by placing the instrument alongside NIST-traceable wet-bulb and dry-bulb reference standards under controlled environmental conditions, recording and comparing readings at multiple points, making adjustments where required, and issuing a certificate of calibration documenting As Found and As Left results.

Micro Precision offers both in-lab and on-site psychrometer calibration, each backed by NIST traceability and a certificate of calibration. In-lab calibration uses our ISO/IEC 17025:2017 accredited labs for fully controlled testing conditions; on-site calibration brings a technician to your facility, ideal for large deployments across greenhouses, storage facilities, or production lines. Faster turnaround is available alongside standard service.

Micro Precision calibrates a variety of psychrometer types and their individual components, including:

• Sling psychrometers
• Aspirated psychrometers
• Digital psychrometers
• Whirling psychrometers
• Wet-bulb thermometers
• Dry-bulb thermometers
• Motor-driven psychrometers
• Handheld field psychrometers

Micro Precision calibrates a variety of humidity and temperature instrument brands, including Extech, Testo, and Vaisala. Psychrometer models not listed here are likely supported as well; contact Micro Precision to confirm calibration availability for a specific make and model. For humidity transmitters, chart recorders, and chambers, see Humidity Calibration Services.

Micro Precision delivers ISO/IEC 17025:2017 accredited, NIST-traceable psychrometer calibration services for sling, aspirated, and digital psychrometers, backed by a network of more than 50 calibration labs. Quality managers get audit-ready documentation. Compliance officers get certificates that satisfy regulatory and customer audits. Procurement teams get a single, accredited vendor for an entire environmental monitoring fleet.

Please complete our quick psychrometer equipment calibration & repair service request form, and a Micro Precision representative will reach out to you same-day during office hours, or within one business day after office hours. (Mon – Friday 8AM – 4PM PST)