Features Dial Size : 100 & 150 mm. Accuracy : ± 1.5% of range span. Sensing Element : Spring SteelStainless Steel Diaphragm. Diaphragm Protection : Teflon, Silver foil (for chlorine) Stainless Steel. Movement : Non ferrousStainless Steel. Top Chamber : Cast aluminiumCast iron, weatherproof stove enamelled black with screwed bezel. Connection : 12" BSP (M). Mounting : Direct with bottomback entry. Ranges : 1, 2, 4, 7, 10, 14, 16, 21, 25 kgcm2, -760 mmhg & Compound -1 ± 25 kgcm2. Capsule : (Low pressure range) : 100, 250, 400, 600, 1000, 1600, 2000, 2500, 4000, 6000 mmwc.