Mr. Pen FD01 2-Line Scientific Calculator
- Two-line LED display
- Scientific and engineering calculator with fractions
- 1 LR44 battery, included
- Hard cover over the keypad
- 5.8 x 5 inches
- Lifetime warranty
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A basic two-line scientific calculator for algebra, college math and engineering coursework. It is not a graphing model, and the listing gives no list of functions or exam approvals.
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ASIN: B08FSGY3VXModel: FD01Category: Scientific Calculators
Overview
A classroom desk or a study table is where this scientific calculator lives, with a two-line display that shows an entry and its result together. It handles fractions as the title says, runs on one button cell and protects the keys with a hard cover.
The reason to buy is a low-clutter calculator that covers fractions and the usual scientific work for students and engineers. The limit is missing detail: function count, solar option and exam approval are all absent. Check your course rules before buying.
Who it's for
Algebra, trigonometry and basic engineering coursework are the fit. Test-takers with strict calculator rules, and users who want to plot equations, need to look elsewhere.
Pros and cons
- Two lines show entry and result
- Hard cover protects the keys
- Not a graphing calculator
- Exam approval not listed
- Battery powered only, no solar
Performance notes
The upper line holds the expression above the answer, so you can check what was typed before trusting the result. Scientific mode covers the common functions in coursework, with fraction entry for exact answers. A single small battery powers it, so heavy classroom use means a replacement now and then.
Specifications
| Brand | Mr. Pen |
|---|---|
| Model | FD01 |
| Dimensions & fit | |
| Item Dimensions L X W | 5.8 x 5 inches |
| Screen Size | 180 centimeters |
| Power & efficiency | |
| Power Source | Battery powered |
| Construction & materials | |
| Enclosure Material | Hardcover |
| Color | Black |
| Compatibility & installation | |
| Compatible Devices | Most devices with keyboard or touchscreen input and screen display |
| Included components | |
| Unit Count | 1 count |
| Warranty & support | |
| Warranty Description | Lifetime |
| Other details | |
| Calculator Type | Engineering/scientific |
| Display Type | LED, two line |
| Number Of Batteries | 1 LR44 battery, included |
| Item Highlight | or Students & Engineers |
| Mfr Part Number | FD01 |
Closest rivals on specs
IPEROT Solar Scientific Calculator 417 Function- Screen Size 70.9 vs 6.5 inches (+991%)
CATIGA CS-229 Scientific Graphing Calculator- Screen Size 70.9 vs 3.3 inches (+2048%)
CATIGA CS-121 Scientific Graphing Calculator- Screen Size 70.9 vs 3 inches (+2263%)
Frequently asked questions
Is the Mr. Pen scientific calculator a graphing calculator?
No. The listing calls it an engineering and scientific calculator with a two-line display.
Does the Mr. Pen calculator come with a battery?
Yes. The listing says one LR44 battery is required and included.
Can the Mr. Pen calculator do fractions?
The title says fraction and college math. A full list of functions is not given.