... Mechanical counter +Current transformer 1. Working voltage rating: 3.5 to 6.5V;2. Working pulse width ... 5%ohm5. Velocity ratio 10:1,20:1,80:1,100:1,200:1,400:1,800:1,1000:16. Working frequency 6Hz7 ... quantity of character wheel): 5+1(five integers with one decimal);6+1(six integers with one decimal); ... working period (≥10years) 13. Base frame material:(1.aluminum alloy base frame: ; 2.plastic base frame ...