These sterile, crystal-clear polystyrene reservoirs feature rigid, reusable bases and clearly marked graduations. The units refract light so graduations below the fluid surface become invisible. Volume graduations are permanently marked on the inside of the complimentary base rather than molded into the reservoir body, so they can clearly be seen and allow for accurate visualization of the amount of fluid being poured into the reservoir. Available in 25 and 100 mL sizes, the reservoirs feature an deep trough that maximizes fluid recovery and minimizes waste.