Dropwise: Fish Tank Water Test

Dropwise runs your liquid test kit session with you. Getting the number is the easy part. The fiddly part is everything before it: the tube, the drops, the shaking, the five minutes of waiting, and the sinking feeling that you have lost count at drop six. Dropwise puts one instruction on screen at a time — fill to the 5 ml line, add eight drops from bottle one, cap and shake for five seconds — and holds the timers for you. When a test needs five minutes to develop, it starts that timer in the background and moves you straight to the next test, so a full round that would take twenty minutes one after another takes about seven. Each test tells you the moment it is ready, even with the device face-down on the worktop. WHAT IT DOES • Guided sessions for the kits people own — a five-test freshwater liquid kit, a six-test freshwater kit, and a GH & KH drop-count pair • A kit builder for…