Used widely to measure the flow of water. Suitable connecting 0.5" male thread water hose. Clear plastic housing read easily, male and female thread. Product Name: Panel Flow Meter Material: Glass, Metal, Plastic Color: Clear, Gray Total Size: 17.6 x 3.2 x 6cm/6.9" x 1.3" x 2.4" (L x W x H) Range: 0.5-5 GPM, 2-18 LPM Male Thread Diameter: 2cm/0.8" Fit Hose Diameter: 1.3cm/0.5" Weight: 212g Package content: 1 x Panel Flow Meter 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.