Just got my DP4 doser 2 days ago. The date and time was set too (but China time) I follwed the calibration instructions and it was already perfectly calibrated.
1ml per sec (well 197secs = 200ml, close enough)
This thing can dose as little as 1ml per month, up to as much as you want. Easy to program, simple to use, and the price?! Money well spent, and saved.
I've never heard another brand of doser run, but the sound is very tolerable.
I bought mine from an eBay seller named "annadebi" for $105us + free shipping arrived in about a week. Even included a Kamoer probe/hose holder for 5 hoses. Hands down the best seller I've ever encountered, tracking numbers, and communication and care above and beyond anything I'd expect from an EBAy seller. Also bought Jebao RW-4 and about to buy RW-8s from her as well.
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