It is used in simple water quality inspection of well water.
Until now, I used it as a virtue type, but there are also a number of items, so I thought without worrying that the expiration date had ended before using up.
Although it becomes expensive, it seems that it can be used up because the number of entries is small.
Since the kit of virtue type is contained in a large aluminum bag all together as a kit, once the big bag is opened, deterioration of the whole will start. I think that it is convenient to prevent deterioration of the unused kit because this kit contains kit one by one in the pouch.
By the way, I inquired to the manufacturer, it seems that the expiration date of use is 24 months. It seems there is no description so I think that it was better to describe it.
Also, things arriving to me reached the expiration date of 19 months ago.
It is possible to take a few days for shipping so if you can order, we want something new a little more.