---
title: Free Power Quality Ruler | PQ Formulas, Standards & Tolerance Curves | Power Monitors, Inc.
description: Request your FREE 6-inch Power Quality reference ruler from PMI. Packed with PQ formulas, IEEE standard limits, ITIC/CBEMA tolerance curves, and engineering reference data. Ships to US addresses only.
image: https://info.powermonitors.com/hubfs/Branding%20-%20Logos%20and%20Designs/PQ%20Ruler-1.png
---
[](https://powermonitors.com)
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Complimentary — US Shipping Only
# Your Free *Power Quality* Reference Ruler
PMI's PQ Ruler packs essential power quality formulas, IEEE industry standard limits, ITIC & CBEMA tolerance curves, and engineering reference material into a durable 6″ ruler — ready for fieldwork or your desk.
PQ Formulas IEEE Standard Limits ITIC / CBEMA Curves Voltage Sag & THD Handy 6″ Format
White Paper
Read the PQ Ruler White Paper while you wait for yours to arrive
Free Webinar
Power Quality Standards & Recommended Practices — Free Class
## Send Me My Ruler
Fill in your shipping details and we'll get it right out to you.
We can only ship to United States addresses at this time.
6"
Ruler Length
100%
Free — No Cost
2
Sides of Data
US
Addresses Only
## Explore the PQ Ruler
Every formula, curve, and table on the ruler, up close. Tap any point to zoom in and read what it is, and click the ruler to flip to the other side.
Every formula, curve, and table on the ruler, front and back. Tap to flip between the two sides.
Click the ruler to flip • Tap a dot for details
Tap the ruler to flip
**Power Quality Formulas** for voltage sag, THD, unbalance, flicker, and more, ready for rapid field reference.
**IEEE Industry Standard Limits** from IEEE 519, 1159, and related standards in one compact format.
**ITIC & CBEMA Tolerance Curves** to see at a glance whether a voltage event falls within acceptable limits.
**Engineering Reference Material** compact enough for a toolbox and detailed enough to be useful on-site.
Close
[](https://powermonitors.com)
Power Monitors, Inc. is an industry-leading product design and manufacturing firm based in Mt. Crawford, Virginia. PMI® strives to solve power quality problems by listening to our customers and working with them to design and manufacture products. Total customer satisfaction is the primary goal of all PMI® staff.
[24/7 Tech Support **800.296.4120**](tel:18002964120)
#### Resources
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- [Support](https://powermonitors.com/support/)
#### Company
- [About Us](https://powermonitors.com/about-pmi/)
- [Contact](https://powermonitors.com/contact/)
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800 N Main St, Mt Crawford, VA 22841 | Toll Free [800.296.4120](tel:18002964120) | Fax 540.432.9430
© 2026 Power Monitors, Inc.
US addresses only — limited availability
[📐 Get My Free PQ Ruler](https://info.powermonitors.com/free-power-quality-ruler#form)
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