Sterile, crystal-clear, disposable reagent reservoirs refract light so graduations below the fluid surface become invisible, simplifying the filling of the reservoir to a desired volume. Because volume graduations are permanently marked on the inside of the rigid, reusable base rather than molded into the reservoir body, they can be seen clearly. Also, accurate visualization of the amount of fluid being poured into the reservoir is possible, virtually eliminating overfilling. Available in 25 and 100 mL, the reservoirs feature an extra-deep trough that maximizes fluid recovery and minimizes waste. They come in several packaging options and nest inside each other.