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PROFESSIONAL AI
& TECHNOLOGY
CALCULATORS.

Verified AI & technology calculator solutions — sourced cheaper than anywhere else. Pay once. Get instant access. Start calculating.

How it works
PROFESSIONAL AI CALCULATORSVERIFIED SOURCESINSTANT ACCESSLOWEST PRICE GUARANTEEDTECHNOLOGY SOLUTIONSPAY ONCEPROFESSIONAL AI CALCULATORSVERIFIED SOURCESINSTANT ACCESSLOWEST PRICE GUARANTEEDTECHNOLOGY SOLUTIONSPAY ONCE

ADD ONS

Accessories & upgrades
Replacement Li-ion Battery Pack top view
Top view Side view

Sigma Core — Add On

REPLACEMENT LI-ION BATTERY PACK

€6.99
Quantity
1

Keep your device powered and ready for long study sessions. Designed as a direct replacement or spare battery, this rechargeable lithium-ion pack ensures uninterrupted performance whenever you need it. ⚡

⚡ Extended Battery Life — High-density rechargeable Li-ion cells keep your device running continuously through full days of use.
🔌 Direct Plug-and-Play — Built-in 2-pin quick connector allows seamless, hassle-free replacement with no soldering required.
🛡️ Built-in Circuit Protection — Integrated safety features protect against overcharging, short-circuiting, and overheating.
📦 Compact & Lightweight — Ultra-slim profile designed to fit perfectly inside the battery compartment without adding unnecessary weight.
What's in the box 📦
🔋 1x Sigma Core Rechargeable Replacement Battery Pack (2-Pin Connector)
Sigma Core ShadowShield Privacy Filter front
Angle view Front view

Sigma Core — Add On

SHADOWSHIELD PRIVACY FILTER

€4.99
Quantity
1

Keep your screen visible only to you. The ShadowShield Privacy Filter is a precision-cut screen overlay designed specifically for the Sigma Core AI Scientific Calculator — blocking side-angle views while keeping your display crystal clear from directly in front. ⚡

🕶️ 60° Privacy Angle — Screen content is invisible from side angles, visible only to the person directly in front.
🔍 Anti-Glare Coating — Reduces reflections and eye strain during extended use under bright lighting.
🧲 Residue-Free Adhesive — Attaches securely and removes cleanly without leaving marks on the display.
📐 Precision Cut Fit — Designed specifically for the Sigma Core calculator display — no trimming required.
💧 Scratch & Smudge Resistant — Durable surface coating keeps the filter clean and clear through daily use.
What's in the box 📦
🕶️ 1x ShadowShield Privacy Filter (Sigma Core Compatible)

HOW IT WORKS

01

We source it

Our team researches and verifies the best sources for professional AI & technology calculators at the lowest price.

02

You pay once

One simple payment. No subscriptions, no recurring fees, no hidden charges.

03

Instant access

Your verified calculator link is delivered to your email within 24 hours of payment confirmation.

POLICIES

WHAT YOU'RE BUYING

Sigma Core is a digital sourcing platform. When you purchase from our store, you are purchasing a verified sourcing link — not a physical product.

After your payment is confirmed, you will receive an email containing a direct link to the cheapest verified source where you can purchase the product yourself at a significantly lower price than retail.

No physical item will be shipped from Sigma Core. The purchase, shipping, and delivery of the physical product is handled entirely between you and the third-party supplier at the provided link.

Fulfillment time: 1–3 business days from the time of payment confirmation.

REFUND POLICY

All sales are final. No refunds are offered.

Due to the digital nature of our products — once a sourcing link has been delivered to your email, the service has been fully rendered and no refund can be issued.

If you did not receive your link within 3 business days of payment, contact us at sigmacore.diy@gmail.com and we will resend it immediately.

By completing a purchase you confirm that you understand you are buying a digital sourcing link and agree to this no-refund policy.

PRIVACY POLICY

Sigma Core collects only the information necessary to fulfill your order — your name, email address, and delivery details.

We do not sell, share, or distribute your personal data to any third parties beyond what is required to deliver your sourcing link.

Your payment is processed securely through PayPal. Sigma Core does not store your payment details at any point.

By purchasing from our store you consent to the collection and use of your data as described above.

TERMS OF SERVICE

By using this website and placing an order, you agree to the following terms:

You acknowledge that Sigma Core sells digital sourcing information only and that no physical product is shipped by Sigma Core.

Sigma Core is not affiliated with, endorsed by, or officially connected to any calculator manufacturer or brand shown on this site. Product images are used for illustrative purposes only.

Sigma Core is not responsible for the quality, availability, or shipping times of any third-party supplier accessed through our links.

These terms are governed by the laws of the Republic of Lithuania.

⚠️ Important: Sigma Core sells digital sourcing links only. You will not receive a physical product from us. After payment you will receive an email with a verified link where you can purchase the product directly from a supplier at a lower price. Fulfillment takes 1–3 business days. All sales are final.