HP 35s Scientific Calculator

The HP 35s is a programmable scientific calculator originally introduced by Hewlett-Packard in 2007 to commemorate the 35th anniversary of the HP-35, the world's first pocket scientific calculator. It was designed to appeal to professional engineers and surveyors, featuring the iconic Reverse Polish Notation (RPN) entry system and a design language that pays homage to classic HP models from the 1970s.

Historically, the calculator was designed by HP in collaboration with Kinpo Electronics of Taiwan and manufactured in mainland China. While Hewlett-Packard originally founded the brand in California, USA, in 1939, the company underwent a major split in 2015. As of November 2021, the development and distribution of HP-branded calculators have been licensed to Moravia Consulting (for Europe and other regions) and Royal Consumer Information Products (for the Americas). Although the 35s was discontinued by the parent company around 2021, it remains a highly sought-after device in professional certification circles.