What does the screen on top of the calvulator do?

That is the solar panel which converts solar radiation (light) to electricity, to power the calculator. There are two almost identical models, this one with the solar panel and another which runs on batteries. Note you only get a basic instruction booklet, the full manual has to be downloaded from the casio web site.

Where is the “SD” button on the new version of this calculator?

Use the key to enter the SD Mode when you want to perform statistical calculations using standard deviation. In the SD Mode and REG Mode, the key operates as the key. Always start data input with (CLR) (Scl) to clear statistical memory.

My previous casio calculator had an arrow button to delete just the last digit typed-can this calculator delete one number without using the c or ac

On this Casio calculator there is a DEL button to do the same function you are describing, very easy!!

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Casio fx-85GTX Scientific Calculator, Black

Casio fx-85GTX Scientific Calculator, Black

Product ID: 100576226

Details

Brand
Casio
Calculator Type
Financial
Colour
Black
Compatible devices
alle Ger te
Display type
LCD
Material
Plastic

📊290+ advanced functions

☀️Dual solar & battery power

🖥️192x63 HD Natural Textbook Display

€ 229.21

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Description

📐 Elevate your calculations — never miss a formula or a moment!

DURABLE PORTABLE - Slide-on hard protective cover and lightweight design keep your calculator safe and ready on-the-go.
EFFORTLESS NAVIGATION - Intuitive menu and key layout streamline complex calculations with ease and speed.
EXAM READY POWERHOUSE - Dual solar and battery backup ensures uninterrupted performance during critical exams.
FUNCTION RICH MASTERY - Over 290 scientific and statistical functions including advanced regression and ratio calculations.
TEXTBOOK PERFECT DISPLAY - Natural textbook display presents equations exactly as in your study materials for instant clarity.

The Casio fx-85GTX is the UK’s best-selling dual-powered scientific calculator, approved for all UK exams and recommended for Key Stages 3 & 4. Featuring a high-definition natural textbook display, 290+ advanced functions, and a durable slide-on cover, it combines reliability with cutting-edge usability to empower students and professionals alike.

Specifications

ASIN	B07L68RQCX
Best Sellers Rank	25,274 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 69 in Scientific Calculators
Box Contents	Lithium Metal batteries
Brand	Casio
Brand Name	Casio
Calculator Type	Engineering/Scientific, Financial
Colour	Black
Compatible Devices	alle Ger te
Customer Reviews	4.7 out of 5 stars 12,236 Reviews
Display Type	LCD
Enclosure Material	Plastic
Global Trade Identification Number	04549526607844
Item Dimensions L x W	16.6L x 7.7W centimetres
Item Type Name	Scientific Calculator
Item Weight	0.18 Kilograms
Manufacturer	Casio
Manufacturer Contact Information	Unit 6 1000 Nth Circular Rd London Nw2 7Jd
Manufacturer Part Number	fx-85GTX
Model Name	fx-85GTX Scientific Calculator
Model Number	fx-85GTX
Model name	fx-85GTX Scientific Calculator
Number of Batteries	1 Lithium Metal batteries required. (included)
Number of Items	1
Number of Packs	1
Number of batteries	1 Lithium Metal batteries required. (included)
Power Source	Battery Powered
Power source	Battery Powered
Product Warranty	3 year manufacturer
Unit Count	1.0 count

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