What’s the difference between this one and the more metallic alternative available when you search for hp 35s, possibly the b12 version?

There is no metallic alternative to the HP 35s. The HP 35s is a retro styled calculator introduced to commemorate the 35th anniversary of the HP-35, the World's first pocket scientific calculator.

Can the HP35s do differential and integral calculus? And can it calculate probabilities from the Normal distribution? What about the test?

page 16-11 of HP35S the manual: normal distribution / inverse normal distribution.Integration is chapter 8. function limits can be entered.

Is there an HP 45 version?

No, HP only do a few calculators now, 35s, Prime and a couple of financial ones and basic scientific.

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📊 Elevate your calculations—where precision meets professional power.

ROBUST MEMORY ARSENAL - Store and protect up to 800 memory registers with 30KB RAM—your data stays safe and accessible.
DUAL MODE INPUT MASTERY - Switch seamlessly between RPN and algebraic logic for ultimate calculation flexibility.
SLEEK PORTABLE POWERHOUSE - Compact 15.8 x 8.2 cm design with long-lasting dual CR2032 batteries keeps you calculating anywhere.
ENGINEERED FOR PROFESSIONALS - Trusted by engineers, scientists, and students; approved for SAT, ACT, AP exams—excel under pressure.
PRECISION AT YOUR FINGERTIPS - Access 100+ built-in scientific functions including logarithms, factorials, and unit conversions.

The HP 35S Scientific Calculator is a programmable powerhouse featuring a crisp 2-line LCD, a fast 8502 processor, and 30KB of RAM with 800 memory registers. Designed for engineers, scientists, and students, it supports dual input modes (RPN and algebraic), over 100 built-in functions, and is approved for major standardized tests. Compact and battery-powered, it delivers reliable, precise performance wherever your work takes you.

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Brand	HP
Product Dimensions	15.8 x 8.2 x 1.83 cm; 376 g
Batteries	2 CR2 batteries required. (included)
Item model number	F2215AA#ABA
Manufacturer	Hewlett Packard
Series	HP 35S
Colour	Black
Standing screen display size	1
Power Source	Battery Powered
Are Batteries Included	Yes
Lithium Battery Energy Content	0.2 Watt Hours
Lithium Battery Packaging	Batteries contained in equipment
Lithium Battery Weight	0.11 Grams
Number of Lithium Metal Cells	1
Item Weight	376 g
Guaranteed software updates until	unknown

HP 35S Scientific Calculator

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