--- product_id: 18514315 title: "Sentry Industries Inc. 56-Function Scientific Calculator, Black (CA656)" brand: "sentry" price: "HK$196" currency: HKD in_stock: true reviews_count: 8 category: "Sentry" url: https://www.desertcart.hk/products/18514315-sentry-industries-inc-56-function-scientific-calculator-black-ca656 store_origin: HK region: Hong Kong --- # high-speed calculations 56 versatile functions durable hard protective case Sentry Industries Inc. 56-Function Scientific Calculator, Black (CA656) **Brand:** sentry **Price:** HK$196 **Availability:** βœ… In Stock ## Summary > πŸ–€ Elevate your calculations with power, speed, and style. ## Quick Answers - **What is this?** Sentry Industries Inc. 56-Function Scientific Calculator, Black (CA656) by sentry - **How much does it cost?** HK$196 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/18514315-sentry-industries-inc-56-function-scientific-calculator-black-ca656) ## Best For - sentry enthusiasts ## Why This Product - Trusted sentry brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Built to Last:** Hard protective case and rubber keys designed for daily hustle durability - β€’ **Display Clarity:** 10-digit LCD display for clear, error-free reading - β€’ **Speed That Keeps Up:** High-speed processing ensures no lag during crunch time - β€’ **Memory & Stats Mastery:** Advanced memory and statistical functions to handle complex data effortlessly - β€’ **Power-Packed Precision:** 56 functions covering everything from binary to hex for every calculation need ## Overview The Sentry Industries CA656 is a black scientific calculator featuring 56 functions, including binary, octal, decimal, and hexadecimal calculations. It boasts a 10-digit LCD display, high-speed processing, memory and statistical capabilities, and comes with a durable hard protective case and rubber keys. Powered by a long-life battery, it’s designed for professionals and students seeking reliable, efficient, and versatile calculation tools. ## Description This scientific calculator has 56 functions, high speed calculations, and a hard protective case. There is a 10 digit display. It has rubber keys. A long life battery is included. Features include binary, octal, decimal, and hex calculations. It also features memory and statistical calculation. Review: Great features, but how durable... - I haven't had this very long so I'll update this if this calculator breaks, malfunctions, etc. I bought this for math (algebra, geometry, algebra 2) because it has so many features for such little money. It doesn't graph of course but for everything else it's great. Hopefully the button batteries last a long time - those aren't cheap and the ones on this look like a pain in the a55 to get out and replace. Again, if this goes bad I'll update. Review: Simplicity and accuracy - This basically hasn’t changed much many years. It is not fancy, basic very good value and efficient. ## Features - 56 functions and 10 digit display - High speed calculation - Binary, octal, decimal, hexcalculation - Memory and statistical calculation - Hard protective case ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000QRDU4A | | Best Sellers Rank | #848,040 in Office Products ( See Top 100 in Office Products ) #340 in Scientific Calculators | | Brand | SENTRY | | Calculator Type | Engineering/Scientific | | Color | Black | | Customer Reviews | 4.3 out of 5 stars 32 Reviews | | Display Type | LCD | | Enclosure Material | high speed calculation | | Global Trade Identification Number | 00080068206569 | | Item Weight | 3.8 Ounces | | Manufacturer | Sentry Industries, Inc. -OP | | Material | high speed calculation | | Mfr Part Number | CA656 | | Model Name | 56-Function Scientific Calculator | | Model Number | CA656 | | Power Source | Battery Powered | | UPC | 080068206569 | | Unit Count | 1.0 Count | | Warranty Description | No Warranty | ## Images ![Sentry Industries Inc. 56-Function Scientific Calculator, Black (CA656) - Image 1](https://m.media-amazon.com/images/I/8153G70DFHL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great features, but how durable... *by W***. on November 8, 2022* I haven't had this very long so I'll update this if this calculator breaks, malfunctions, etc. I bought this for math (algebra, geometry, algebra 2) because it has so many features for such little money. It doesn't graph of course but for everything else it's great. Hopefully the button batteries last a long time - those aren't cheap and the ones on this look like a pain in the a55 to get out and replace. Again, if this goes bad I'll update. ### ⭐⭐⭐⭐⭐ Simplicity and accuracy *by S***W on July 8, 2020* This basically hasn’t changed much many years. It is not fancy, basic very good value and efficient. ### ⭐⭐ Do Not Buy This Product *by L***N on May 22, 2018* Batteries were badly corroded. The numerals 4 and 8 do not work --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hk/products/18514315-sentry-industries-inc-56-function-scientific-calculator-black-ca656](https://www.desertcart.hk/products/18514315-sentry-industries-inc-56-function-scientific-calculator-black-ca656) --- *Product available on Desertcart Hong Kong* *Store origin: HK* *Last updated: 2026-07-01*