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