Review on Jebao Programmable Auto Dosing Pump DP-4: Efficient and Flexible Black Dosing Pump by Pamela Johnson

Excellent value for money. If you calibrate it properly IMHO it's worth every penny. They come pre-calibrated but may vary slightly depending on the fluids and tubing used. Just calibrated. Use a measuring cup with 100ml of the product you wish to dispense and the pre-cut length of tubing used. Then fill the test tubes with liquid in the manual feeding by pressing the left arrow. After that go to calibration, select the pump and start the calibration by pressing the up arrow. Once you have reached 100ml in the measuring cup, press the up arrow again and it will program the time it takes to pump 100ml. Then all you have to do is adjust your schedule. I dose Calc, Alk, Mag and Iod. Thumbs up 👍👍 and saved me a few hundred.