Compact Darkroom Developing Tank 2 Spiral Reel. Use this professional dual-reel film developing tank to effortlessly develop perfect negatives. The included dual-reel spool is compatible with both 35mm and 120 film formats, allowing you to batch-process multiple rolls simultaneously—thereby effectively saving both precious time and developing chemicals. The unique spiral reel design ensures a smooth and hassle-free film-loading process. The tank body is constructed from a robust, specialized plastic that boasts exceptional chemical resistance; it not only withstands repeated immersion in standard darkroom solutions but is also easy to clean, leaving it fresh and ready for use after every development session. Furthermore, the stable, non-slip base ensures the tank remains steady and secure throughout the agitation process.