A 9/10 for this kit. If you're dosing copper it's really important in my opion to the readings exact for obvious reasons, and although a pricey bit of kit, I felt it necessary to measure copper to the enth degree to protect my charges.
In practice, I've found that the age-old problem of the sachets spilling the powder outside the test tube is not a problem because I've noticed there's an excess of powder to fulfil the test, so a little dropped outside makes no difference.
The sachet spillage is a concern that many people have about Hanna kits, I have a tiny funnel from a hip flask to help with that, but because of the above, I don't even use it on this copper test kit.
It dropped a point because each test costs about 80p, which is high for a daily test kit for 30 days.