Advantage: With its stackable feature, it allows you to maximize your storage space by vertically stacking multiple racks on top of each other. Made from durable material, it is built to withstand daily use in busy laboratory environments. Each hole has a scale for easy positioning of samples, making it quick and efficient to retrieve or place vials when needed. Instruction: Insert the vials into the compartments of the vial holder. When you need to access a specific vial, simply locate it within the rack and gently lift it out. Application: This test tube rack provides a convenient and organized solution for storing and organizing autosampler vials, helping to streamline your laboratory work flow. Suitable for HPLC, GC, LC/MS applications, high-throughput analysis sample preparation, lab research, and more. This tube holder offers versatility in accommodating different lab needs. Note: Ensure that the tube rack is completely dry before reusing or stacking. Specification:20ml Colour:White Material:plastic Package Contents: 1 x Test Tube Rack Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.