Identification guides

Use these pages when you need to decode a label, measure a component, or understand what a standard designation actually means. Each guide explains the naming logic so you can identify the right part even when the original is missing or illegible.

Battery identification

• How to read a battery label — decode chemistry codes, capacity ratings, and date stamps

Bulb base identification

• How to measure a light bulb base — ruler and caliper method for Edison screws and pin bases
• What does E26 mean? — explains the Edison screw naming convention (letter + diameter in mm)

Related cheat sheets

• Coin cell equivalents — cross-reference table for CR2032, CR2025, LR44, and more
• Hearing aid battery reference — color codes and size guide
• Light bulb bases quick reference — visual overview of all common base types

Looking for a device guide instead?

If you already know the device and want the answer fast, see the Device Guides — they cover batteries, bulbs, fuses, fasteners, and cables by device type.