Guides and advice
Buying guides and practical advice
Caméras de surveillance
Security camera specs explained: what to check before buying
Megapixels, focal length, IR range, IP rating, person detection: what each line of the spec sheet changes in the picture, with a pixels-per-metre calculation to tell whether a face will be recognisable.
Caméras de surveillance
Planning a CCTV system: zones, cabling and remote viewing
Areas to cover, number of cameras, coax, IP or Wi-Fi, parts, installation and remote viewing: the steps to plan a complete CCTV system.
Office laser printer: volume, speed, network and toner
The criteria that matter for an office laser printer, from monthly volume to toner and drum costs, with a comparison of common models.
Choosing a WiFi camera: resolution, night vision, storage, setup
The real resolution behind the 2K label, infrared or colour night vision, IP rating, power and storage: what to check before buying a WiFi camera.
Mono vs colour laser printer: cost per page, toners, speed
A mono laser uses one toner, a colour laser uses four. How to work out cost per page, read speed figures and choose based on what you print.
Make a laser printer last: toner, drum, paper and dust
What wears out a laser printer, part by part: toner and drum, compatible cartridges, paper, dust, firmware and print volume.