Square cuvette with four sides and integral reference marks available in a choice of construction materials. ULTRA-VU polystyrene and ULTRA-VU polyethylene average 70% light transmission at 340 nanometers with a maximum variance of +/- 3% and up to 80% at 800 nanometers. Cuvettes are packaged in trays made of recyclable polystyrene foam to eliminate the risk of scratching and are shrink-wrapped to ensure a dust-free condition. Please see our caps pages for cuvette capping options.