- - Scanner type: Flatbed & ADF scanner 1200 x 1200 DPI
- - Color scanning Duplex scanning
- - LCD Built-in display
- - A4 Scanning media types supported: Envelopes, Labels, Photo paper, Plain paper
- - Maximum scan size: 8.5 x 11.7" (216 x 297 mm) Sensor type: CIS
- - USB port
- - Power supply type: AC
- - Internal memory: 512 MB 550 MHz
HP SCANJET PRO 3500 F1 FB CLR 1200DPI USB3.0 A4-A6 B5 25PPM
Get reliable, high-speed scanning for complex projects—this scanner can handle 3,000 sheets per day. Scan both sides of the page at up to 50 images (25 pages) per minute. HP EveryPage helps avoid misfeeds and simplifies your workflow.
Fast, reliable two-sided scanning
- Produce up to 50 images (25 pages) per minute with two-sided scanning. Reliably scan 3,000 sheets per day.
- Capture every page easily—even for stacks of mixed media—with HP EveryPage and an ultrasonic sensor.
- Scan documents up to 21.6 x 309.9 cm (8.5 x 122 in) through the ADF, and use the flatbed for bulky media.
- Spend less time waiting—scans reach their destination at fast speeds with a USB 3.0 connection.
Work smarter with quick, simple scanning
- Define scan profiles for common document types and scan to multiple destinations with HP Scan software.
- Create one-button scan settings for recurring tasks and make selections using the LCD control panel.
- Quickly share or archive scans directly to popular cloud destinations with HP Scan software.
- Scan directly into applications without opening another program with HP’s full-featured TWAIN driver.
Sharp images and accurate text capture
- Accurately capture text from documents for easy editing with HP Scan and I.R.I.S. Readiris™ Pro OCR software.
- Get sharp, true-to-life scans of documents, graphics, and photos with up to 1200 dpi resolution.
- Book-edge scanning prevents distorted text, even near the spine of books and other bound materials.
- Auto-imaging features in the included HP Scan software let you enhance images and delete blank pages.
HP Scanjet Pro 3500 f1, 8.5 x 11.7" (216 x 297 mm), 1200 x 1200 DPI, 24 bit, 25 ppm, 25 ppm, 50 ipm
HP Scanjet Pro 3500 f1. Maximum scan size: 8.5 x 11.7" (216 x 297 mm), Optical scanning resolution: 1200 x 1200 DPI, Input color depth: 24 bit. Scanner type: Flatbed & ADF scanner, Product color: Gray, Display: LCD. Sensor type: CIS, Daily duty cycle (max): 3000 pages, Light source: LED. Maximum ISO A-series paper size: A4, Scanning media types supported: Envelopes, Labels, Photo paper, Plain paper, ISO A-series sizes (A0...A9): A4, A5, A6. USB version: 3.2 Gen 1 (3.1 Gen 1), Standard interfaces: USB 3.2 Gen 1 (3.1 Gen 1)
At just over £300 from Ebuyer (around $425, or AU$565), the HP ScanJet Pro 3500 f1 is one of the cheapest flatbed scanners on the market, but unless faster scanning is an indispensable requirement, as is a daily duty cycle higher than 1,500 pages, I would... 
One of the cheapest flatbeds out there, Impressive scan speeds, Has an automatic document feeder... 
It's a hefty device, Paper handling issues, There are simply better options for many... 
