Description Net content: 30ml Features 1. High-purity methylene blue drops, laboratory-grade quality, ensures safe and effective use every time, suitable for a variety of professional scenarios. 2. Accurate concentration ratio, easy to measure and use, specially designed dropper bottle is convenient to control the dosage and avoid waste. 3. Widely used in aquaculture, medical testing and chemical experiments, with multiple functions such as antibacterial and antioxidant to meet different needs. 4. Environmentally friendly packaging, light-proof storage for longer lasting, effectively extending the service life of the product, providing stable protection for your experiments and treatments. 5. International standard certification, in line with the strict requirements of cross-border e-commerce platforms such as Amazon and eBay, rest assured to buy, worry-free after-sales. Comments: 1. The manual measurement tolerance is 2-5g. Please don't mind your replacement. 2. Due to differences between different monitors, the image may not reflect the actual color of the item. Thank you very much! 3. The SKU color is the color of the product packaging Package includes: 1 * Methylene blue drops