I am very picky when it comes to teal/turquoise inks. Often I find that they are too dark, or lean to far in the blue or green direction and don't strike a harmonious balance. The one that I have liked the most so far is Iroshizuku Ku-Jaku, but even that one would not get enough use to justify the purchase of a full bottle. This particular sample was part of an order from Vanness Pens a while ago that I have recently gotten around to trying out.
This ink was fine in the performance department, behaving pretty well on the wide range of paper types I encountered while grading. The color is okay, but I prefer the more saturated version that I got on cheaper paper versus the somewhat pale appearance on Tomoe River (what you see above). I would ask for more shading and water resistance, but that's a personal preference.
Overall, this ink is nice but not great. The one thing that I will give it is that the lack of extreme shading means that you could probably get away with it in an office environment but the color was different enough from the royal blue that most pens use to also allow me to use it for grading. I also am not sure that it's sold anywhere other than Vanness Pens, so if you want it you are at the mercy of whether they can stock it. My recommendation is to go with Ku-Jaku because it's so much more widely available and I think it's a superior teal.