Terms of Service

Introduction

Welcome to MechPen (“we,” “our,” or “us”). These Terms of Service (“Terms”) govern your use of our website at mechpen.com and all associated tools, guides, and services (collectively, the “Service”).

By accessing or using the Service, you agree to be bound by these Terms. If you disagree with any part of them, please do not use the Service.

Acceptance of Terms

By accessing, browsing, or using MechPen, you acknowledge that you have read, understood, and agree to be bound by these Terms and our Privacy Policy, which is incorporated by reference.

We may update these Terms at any time. Your continued use of the Service after changes are posted constitutes acceptance of the revised Terms.

Estimating Aids — Verify Before You Rely

MechPen’s tools are informational aids. They apply simplified models and typical values to the figures you enter and round results for readability, so a result depends entirely on your input and on the assumptions of a simple model. Nothing on the Service is a manufacturer specification or professional advice. Before you rely on a result for a purchase or for professional work, confirm the details against the manufacturer’s own figures or your own measurements.

Description of Service

MechPen provides free, browser-based tools and educational resources, including:

• An ink refill life estimator for cartridges, converters, and gel refills
• A pencil lead hardness selector and grade converter
• A fountain-pen nib size converter (Western and Japanese sizing)
• A pen weight and balance comparator
• An ink dry-time estimator and an EDC carry-weight calculator
• Guides, explainers, and reference content on pens, pencils, ink, and paper

All tools are provided free of charge. We may modify, suspend, or discontinue any part of the Service at any time.

Your Responsibilities

When using the Service, you agree to:

• Use the tools in good faith for learning, comparison, or personal projects
• Enter values in the correct units and check that your inputs are realistic
• Not disrupt, overload, or attempt to compromise the website
• Respect intellectual property rights

You are responsible for exercising your own judgment and for confirming important details before relying on them.

Accuracy and Disclaimers

While we aim for sensible models, we cannot guarantee that every estimate is correct or suited to your circumstances. Results are approximations based on typical values and the figures you provide, and are rounded for display. MechPen makes no warranties, express or implied, including implied warranties of merchantability, fitness for a particular purpose, or non-infringement.

Intellectual Property

All content on this website — text, graphics, logos, tools, and software — is the property of MechPen or its content suppliers and is protected by applicable copyright and other laws. You may use the tools for personal and educational purposes; you may not copy, resell, or reverse engineer them, or remove proprietary notices.

Limitation of Liability

In no event shall MechPen or its suppliers be liable for any damages (including, without limitation, a disappointing purchase or other losses) arising out of your use of, or inability to use, the Service, even if we have been advised of the possibility of such damages.

Third-Party Links and Ads

The Service may link to third-party websites, including retailers via affiliate links, and displays third-party advertisements. We do not control and are not responsible for their content, and inclusion of a link or ad is not an endorsement. Your use of any third-party site is at your own risk.

Governing Law

These Terms are governed by and construed in accordance with the laws of the United States, and you submit to the exclusive jurisdiction of the courts located there.

Contact Information

• By email: support@mechpen.com
• Via our contact page