The 78050 Ritchie Yellow Jacket Digital Electronic Manometer is an easy-to-use instrument which provides a continuous display of the measured positive or negative pressure. Ideal for setting gas pressure at manifold, checking pressure, flue draft and air balancing. Kit includes battery, 18" tubing and brass fitting. Has a range of -19.95" to 19.95" water gauge with 0.05" water column resolution. Features a large LCD display, Automatic off, Long battery life and is Made in the USA.