The bottle and transfer pipette are a good match in use. It is suitable for weak acid and weak base solution. Its specifications include 2ml, 3ml, 4ml, 5ml, 7ml, 8ml, 10ml, 12ml, 15ml, 30ml, 50ml and 100ml. The structures of dropper cap are divided into screwing type and flip type. Total four models of dropper caps can be selected. Users can choose among these types or require customization according to their needs; Their bottle body colors include milk-white, clear, amber and black. amber and black bottle bodies have good light avoiding property. Their cap colors include white, black, amber, red, green, blue, yellow, purple, orange and pink. Their caps support color customization.