Make:

The Maker's Edition Pocket Ref

No Maker's Tool Kit Should Be Without One

We keep asking ourselves, "If there was just one tool that no Maker should be without, what would it be?" This may just be the tool we'd pick. This great little book is a concise all-purpose reference featuring hundreds of tables, maps, formulas, constants & conversions and it still fits in your shirt pocket! Packed with mathematical formula, tables, standard conversion ratio, scientific fact, technical specification, electric wire size vs. load, resistor color codes, Morse code, sun & planet data, earthquake scales, nail sizes, geometry formulas, currency exchange rates, carpentry, automotive, physical science, water friction losses, charts for battery charging, lumber sizes & grades, floor joint span limits, insulation R values, periodic table, and as they say, much, much more! It's no wonder The Pocket Ref was featured in MythBusters.

And now, with each two-year subscription to Make Magazine, you'll receive your own Make Special Edition Pocket Ref as our gift to you. And if you already subscribe, we'll extend the same offer on any two-year renewal: