: Triplet lenses offer the highest image quality compared to simpler singlet or doublet options.
: Look for models with an automatic lamp changer , which allows you to switch to a backup bulb instantly by flipping a switch if the primary one burns out during a session. buy overhead projector
A budget-friendly, sturdy choice for basic classroom presentations with 2,000 lumens of output. These are frequently found on eBay as reliable used or "new-old stock" units. Nobo Quantum Overhead Projector $242.92(£180.00) Go to product viewer dialog for this item. : Triplet lenses offer the highest image quality