This vintage Thwing-Albert portable pH meter from the 1920s is a must-have for any collector or enthusiast of historical scientific instruments. With its sleek and sturdy design, this meter is a testament to the high-quality craftsmanship of the era. Its compact size makes it a great addition to any display case or shelf, and its intricate details are sure to impress. Whether you are a seasoned collector or simply appreciate the beauty of historical scientific instruments, this Thwing-Albert portable pH meter is a must-see.