- Made from sustainably sourced hardwood with smooth, splinter-free edges for durability and safe handling. - Angled hardwood design provides secure hold for standard colorimetric tubes (10–30 mm diameter) with slip-resistant silicone base cushions for stable, reliable placement. - Space-saving vertical rack configuration keeps the workbench organized while giving you a clear view of each tube for quick identification and access. - Use in routine colorimetric assays to keep tubes upright during prep and measurement, reducing spills and mix-ups. - Ideal for teaching labs and demonstrations, allowing multiple tubes to be displayed in one compact, easy-to-scroll setup. - Suitable for QC and small-scale testing on crowded benches or mobile setups where space is at a premium, ensuring fast access without sacrificing visibility.