Specification Category
Typical Specification / What to Look For
Maximum Load Capacity
E.g., around 150 kg (≈330 lb) or higher for industrial use.
Material & Construction
Heavy-duty aluminium (e.g., 6063-T5 alloy, ~1.5 mm thickness) or sturdy steel.
Height / Reach / Configurations
Multiple modes: step ladder (“A”-frame), straight extension, platform mode; e.g., ladder up to ~5.7 m reach. 
Folded / Storage Dimensions
Compact folded size for storage/portability when not in use. 
Step / Rung Details & Platform
Step spacing, platform height when used as a platform, guard-rails or tool tray in some models. 
Safety Features
Anti-skid feet, stabiliser bars, locking hinges, certified standards (e.g., EN 131) for industrial safety. 
Weight of Ladder (Empty)
Ladder’s own weight for portability — can vary (e.g., ~10-20 kg depending size and material).
Finish / Durability
Corrosion-resistant finish (anodised aluminium, powder coating), reinforced components for long life.