Electronic Equipments & Tools

OS-991ES Scientific Calculator Dual Power With 417 Functions Solar Hesap Makinesi Calculadora Cientifica Office Calcolatrice

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98.9 star rating
98.9 of 100

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Model Number
Brand Name
Applicable Battery Type
Dual Power Supply
Max. Digits
Power Source

24 Jul 2017
Thanks, exact to the description.

- L**s G.
23 Jul 2017

- Anonymous
22 Jul 2017

- A**** S
20 Jul 2017
All as in the description.

- A*** B
20 Jul 2017

- Anonymous Buyer
18 Jul 2017

- B*r L.
15 Jul 2017

- I*****o J.
14 Jul 2017

- J***r M.
13 Jul 2017

- M*****o Z.
15 Jun 2017
Very good calculator) Works fine (10 days of use) a lot of unnecessary features (especially in the region of physics). despite the plastic case not brittle; fully match the description I have less ?????????? calculators are ~ 5 $ higher If in doubt, this order-boldly take, thing is really high quality (* ?) ? *)

- C****e L.
05 Jul 2017

- A***r E.
07 Jun 2017
Very satisfied! a lot of functions, everything works, the quality is good. this model is a complete analog FX-991ES Plus from casio, the operating system respectively 911es plus. on the site casio has detailed instruction Russian for him. Suitable for ??? on physics, for it even has the resolving certificates from casio ?????? on site.

- A***m M.
27 Jun 2017
Nice calculator, thnx for gift

- K***e L.
24 Jun 2017

- Z*v M.
23 Jun 2017
Thank you

- J**i P.
22 Jun 2017

- L**z N.
13 Jun 2017
Veri good condition. I also recieved a polite message from the seller on the package box.

- R****n M.
12 Jun 2017
Delivered quickly. fits the description. friendly and reliable supplier

- A****i K.
11 Jun 2017
???? ?????????. ????????? 20 ????? keld?.

- D*****r U.
15 Jun 2017

- L**z A.

Quick Details

  • Style: Scientific
  • Max. Digits: 10+2
  • Power Source: Solar
  • Material: Plastic, ABS
  • Usage: For students
  • Brand Name: Persona
  • Model Number: OS-991ES
  • Place of Origin: Guangdong, China (Mainland)
  • Item: 991ES calculator
  • Color: Silver
  • Size: 83*162*17mm
  • Weight: 138g
  • Design: Scientific
  • Power: button cell/solar battery
  • Logo: can be customized
  • Packing: 1. no original packag; 2. with original packag
  • Certificate: CE&ROHS

403 functions scientific 991ES calculator

Packaging: each in Hard cardboard box, Better protection.


Product Description

1.Fraction calculations

2.Combination and permutation
Statistics (List-based STAT data editor,
standard deviation, regression analysis)
3.9 variables
4.Table function
5.Comes with new slide-on hard case
6.Equation calculations
7.Integration/differential calculations
8.Matrix calculations
9.Vector calculations
10.Complex number calculations
11.CALC function
12.SOLVE function
13.Base-n calculation


8 Different Languages Specification,with Original packaging

(Turkish, Korean, Polish, Spanish, English, Chinese, French, Norwegian)

Pls note which languages you need, Or We will distribution according to the official language of the country



Shipping CompanyShipping CostEstimated Delivery Time
DHL3 - 7 days
UPS Expedited3 - 7 days
EMS5 - 14 days
Post Air MailFree Shipping15 - 45 days
Return PolicyIf the product you receive is not as described or low quality, the seller promises that you may return it before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe) and receive a full refund. The return shipping fee will be paid by you. Or, you can choose to keep the product and agree the refund amount directly with the seller.

N.B.: If the seller provides the "Longer Protection" service on this product, you may ask for refund up to 15 days after order completion.
Seller ServiceOn-time DeliveryIf you do not receive your purchase within 60 days, you can ask for a full refund before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe).

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