Water Column Low Range Pressure Gauges Designed for Low Pressure Measurement of Non-corrosive Gases, Commercial Heating, Gas Distribution and Filtration. Element Made of Brass or Ss 316 Capsule. Available in Dial Sizes 63, 100 and 150 Mm with Choice of Mounting and Connection Accuracy 2% for 63 Mm, 1.6% for 100 Mm and 150 Mm. Standard Pressure Range is Mmwc, Mbar and Inches of Water Column. Very Low Pressure Ranges from 25 Mbar upto 600 Mbar.(1) Built-in Capsule Type (compact) : Cast Aluminum Body, Weather Proof Case, Stove Enameled Black Finish, Brass Movement. Sensing Elements, Non-ferrous Inside Capsule, Accuracy 1.5%, Range upto 6000 Mmwc, also in Equivalent We Dial Scale Bottom Connection, Direct Mounting: Dial Size : 63mm, 100mm, 150mm Range : 500 to 6000 Mmwc, Connection : 1/4"bsp(m), 3/8"bsp(m), 3/8" Bsp(m)