WECKEW WK-991MS 401-Function Scientific Calculator

The WECKEW WK-991MS is a scientific and engineering calculator listed with 401 functions, a two-line LCD and solar power. Its claimed range includes trigonometry, fractions, regression and permutations, with a button battery also specified for power.

At a glance

The listing claims 401 functions, including percentages, trigonometry, summation, fractions, regression and permutations or combinatorics.
Two-line display is described as showing a calculation formula alongside its result, with a 12-digit display claim.
Solar power and an LR44 button battery are both specified.
A sliding cover is claimed in the feature text.

Price

£7.64Save 24%

Reference price: ~~£9.99~~

Price checked: 13 Nov 2026

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Pros and cons

Pros

The broad listed function set covers common scientific and statistical operations, including fractions and regression.
A two-line layout can help users review an entered expression alongside its result.
Solar power is listed alongside a specified button battery.

Technical specifications

14 specifications

Identity
Brand	WECKEW
Model	WK-991MS
Calculator type	Business, Engineering/Scientific

Display
Screen size	2.36 Inches
Display technology listed	LCD

Functions and operation
Functions claimed	401
Display layout	2-Line LCD Display
Display digits claimed	12-digits
Auto shut-down	No operation in 5min

Power and battery
Power configuration	Solar Powered
Battery listed	1 LR44 batteries required. (included)

Dimensions and materials
Dimensions listed	7.9L x 7.8W centimetres
Material listed	Plastic
Colour	Navy blue

What to know before buying

Listing details to confirm

The title and feature text claim 401 functions and a two-line 12-digit display, while other listing details provide screen size and dimensions that do not fully clarify the display layout or digit arrangement. The listed dimensions of 7.9L x 7.8W centimetres also differ from the description's Item Size：15.7 * 7.8* 1.7cm. Confirm the exact model's size and display configuration before buying.

Who is it for?

A good fit for

Students looking for a handheld scientific calculator for GCSE or A-level study, subject to checking any exam calculator rules.
Users who need listed trigonometric, fraction, regression or conversion functions for study or routine calculations.
Teachers or office users wanting a two-line scientific calculator.

Less suited to

Buyers who need confirmed exam-board approval or a verified function-by-function compatibility list, since neither is established in the supplied details.
Anyone who needs a confirmed physical size before purchase, given the inconsistent dimensions in the listing.

WECKEW WK-991MS 401-Function Scientific Calculator · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 481 ratings

5 stars71%71%
4 stars16%16%
3 stars8%8%
2 stars2%2%
1 star3%3%

Customer feedback describes the calculator as working well for most functions and being useful for GCSE study, scientific calculations and conversions. Buyers also report positive impressions of value and suitability. This aligns with the listed scientific functions and student focus, but the feedback does not confirm exact function coverage, display configuration or dimensions.

Positive themes

Customers report that the calculator works well for most functions.
Customer feedback highlights perceived value and suitability for GCSE study and beyond.

Frequently asked questions

Does the WK-991MS use solar power or a battery?

The listing specifies solar power and an LR44 button battery, described as included. It does not clarify how the two power sources work together.

What functions are listed?

The listing claims 401 functions and names percentages, trigonometry, summation, fractions, regression, permutations and combinatorics. It also mentions logarithms, powers, roots and conversions.

Is the display two-line?

The title and feature copy describe a two-line LCD display and claim a 12-digit display. Check the selected listing for the exact screen layout, as the details do not fully resolve the digit arrangement.

Are the dimensions clear?

No. The details list 7.9L x 7.8W centimetres, while the product description gives a different three-dimension size. Confirm the dimensions for the exact model before ordering.