1.Dual instrument display, clearly knowing the air pressure data 2.Upgraded to grey design, it is both beautiful and practical 3.Professional sealing technology with high adjustment accuracy 4.High-precision tuning can easily achieve one bubble every three seconds 5.By adopting the design of adding modules in a split path, the design of module diversion can be added as needed The quick-insertion bubble meter is designed simply and conveniently Both side-opening gas cylinders and top-opening gas cylinders can be designed for conversion Just perform the module direction conversion and then adjust the gas cylinder interface to keep the bubble meter vertically observed. Additional requirements for separators: Separators can be added according to the size of the fish tank, allowing the use of fish tanks of sizes! Model/thread interface: Support TR21-4 Power supply: Input AC110-240V, Output DC12V (Global version) (The product appearance and printed words depending on the batch, but this does not affect use) Voltage: 110-240V Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on Colour:As Shown Material:Aluminum Alloy + Acrylic Package Contents: 1 x CO2 Regulator Dual Meter Solenoid Valve Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.