This rare boxed vintage daylight factor calculator slide rule as seen in the photo’s is a rare collectable tool used by building researchers and engineers to accurately measure daylight levels.

This precision slide rule is made of durable plastic material, making it both practical and long-lasting. Its unique design and functionality make it a valuable piece of scientific equipment that is sought after by enthusiasts and professionals in the field of engineering and surveying.

Perfect for collectors or those interested in the history of building research methodologies.

What you see is what you are buying .

Related Items:

Lot of 3 VERY RARE Beer Tap Handles: Lutgarde, Old Milwaukee, and La Debauche

$1825.00

---

Very Rare Hermetic Occultist “Yod Je Vau Je” Freemason Medallion Gold Plated 23

$239.20

---

Most Power Queen Succubus Ring Very Rare

$61.00

---

---