does it do mean and standard deviation?

The answer to this question is perhaps. The problem is the instruction booklet does not go with the calculator. Keys mentioned in the booklet are not present on the actual calculator and that includes buttons necessary for mean and SD calculations. I have spent a lot of time on this calculator and so far have not been bale to get mean or SD. The Chinese manufacturers need to produce an instruction booklet that refers to the particular calculator in question. As it is I cannot recommend this calculator.

How do you change it to radian mode?

Press the key Mode/clr key several times until DEG RAD GRA appears. Then press the number under the word RAD.

I have a function question. if i want to square root 9, do i input 9 1st, or do i select the square root function 1st?

Select the square root function first.

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

2-Line Engineering Scientific Calculator, Suitable for School and Business (Black)

2-Line Engineering Scientific Calculator, Suitable for School and Business (Black)

Product ID: 44215738

Details

Brand
Helect
Calculator Type
Color
Black
Power Source
Battery
Screen Size
6.3

📊1 & 2 variable stats

🔢240 scientific functions

🖥️12-digit 2-line HD display

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

875866₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vietnam.

Secure transaction

Details

Brand
Helect
Calculator Type
Color
Black

Description

🧠 Elevate your calculations—because precision is the new power move.

BUILT TO LAST READY TO PROTECT - Durable sliding case shields your calculator from daily wear and tear.
ERGONOMIC DESIGN MEETS PRECISION - Comfort grip and responsive buttons keep you focused and efficient.
VERSATILE MODES FOR EVERY SCENARIO - Switch seamlessly between degrees, radians, grads, and engineering notation.
DUAL LINE DISPLAY FOR INSTANT CLARITY - See your input and result simultaneously—no more guesswork.
MASTER COMPLEX CALCULATIONS EFFORTLESSLY - 240 advanced scientific functions to power through any problem.

The Helect 2-Line Engineering Scientific Calculator is a professional-grade tool featuring 240 scientific functions, a crisp 12-digit dual-line LCD display, and ergonomic design. Ideal for students and professionals alike, it supports complex statistical calculations and multiple angle modes, all protected by a durable sliding case for everyday reliability.

Specifications

ASIN	B01MCQMORK
Best Sellers Rank	#23,167 in Office Products ( See Top 100 in Office Products ) #24 in Scientific Calculators
Brand	Helect
Calculator Type	Engineering/Scientific
Color	Black
Customer Reviews	4.4 out of 5 stars 21,247 Reviews
Display Type	LCD
Enclosure Material	Plastic
Item Dimensions L x W	0.63"L x 0.33"W
Item Weight	180 Grams
Manufacturer	Helect
Mfr Part Number	H-1002-
Model Number	H-1002-
Number of Batteries	1 AA batteries required.
Power Source	Battery Powered
Screen Size	6.3 Centimeters

Reviews

P**N

16.10.2025

C**G

1.07.2021

K**S

6.04.2026

D**1

13.09.2022

S**N

24.03.2024

E**Z

6.10.2025

C**Y

24.03.2018

R**H

8.04.2022

S**O

20.10.2025

B**A

22.04.2026

L**E

15.01.2026

L**A

24.09.2020

桑**哉

23.07.2020

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.