The HARDI 893211 Spray Test Paper is a genuine HARDI accessory designed for easy and quick verification of spray droplet size and pattern. This water-sensitive paper is initially yellow and changes to blue upon contact with water droplets, providing a clear visual indication of spray distribution. Each box contains 50 sheets, with individual sheets measuring 76 mm in length and 52 mm in width. It is an essential tool for optimizing sprayer performance and ensuring efficient application.