... compass periodically. Small bubbles in the liquid are of no importance. They may appear and disappear with changes of ... W./N.W.: 19.8/19.2KgsEM1814-5 Button Compass, Dia14mm, 0.7gEM1815-1 Button Compass, Dia15mm, 0.8g Packing: 20Pcs/ ... Dia25mm, 2.2gEM1827 Button Compass, Dia27mm, 3.2g EM1835 Button Compass, Dia35mm, 8.4gEM1835-1 Button Compass, Dia35mm,4.8gEM1840 Button Compass, Dia40mm, 12gEM1836 ...