Model	Description
MARK II 25	Molded plastic manometer, range 0-3" w.c., red oil, .826 sp. gr.
MARK II 26	Molded plastic manometer, range 0-7" w.c., blue oil, 1.91 sp. gr.
MARK II 27	Molded plastic manometer, range 0-7000 fpm, red oil, .826 sp. gr., requires Pitot tube sold separately.
MARK II 28	Molded plastic manometer, range 0-10,500 fpm, blue oil, 1.91 sp. gr., requires Pitot tube sold separately.
MARK II M-700PA	Molded plastic manometer, range 10-0-700 Pa, red oil, .826 sp. gr.
MARK II MM-180	Molded plastic manometer, range 0-180 mm w.c., blue oil, 1.91 sp. gr.
MARK II MM-80	Molded plastic manometer, range 0-80 mm w.c., red oil, .826 sp. gr.

Specifications

Accuracy:

±3% FS.

Temperature Limits:

Inclined/Vertical Models: 140°F (60°C); Inclined Models: 150°F (65°C).

Pressure Limits:

Inclined/Vertical Models: 10 psi (70 kPa); Inclined Models: 15 psi (100 kPa).

Scale Length:

Inclined Models: Approx. 8-1/4" (21 cm).

Weight:

Inclined/Vertical Models: 1.04 lb (472 g); Inclined Models: 1.23 lb (558 g).

Features

• Construction - Mark II Manometers are economically priced, compact and available in both stationary and portable configurations. Portable stand is standard on Model 40, available as optional A-612 stand for Model 25. Construction is simple with virtually indestructible molded white styrene-acrylonitrile housing, indicating tube and fluid wells, molded ABS knobs and zero adjust plunger, shock mounted glass level vial and leak proof "O" ring seals. Moderate overpressures are accommodated by an overflow tank incorporated in the Model 25. Greater protection is provided by float operated overflow traps in the Model 40. Scales are lithograph printed on aluminum and epoxy coated.
• Installation - Mark II Manometers can be mounted on any vertical surface with the two mounting screws provided. A built-in spirit level simplifies leveling before mounting screws are tightened. Simply fill the reservoir, adjust fluid level to zero, connect the tubing, and the gage is ready for operation.
• Accessories - Included with each Mark II manometer are two tubing connectors for 1/8" pipe or sheet metal ducts, two mounting screws, 1 ounce bottle of indicating fluid, red and green pointer flags and complete instructions.
  The Model 25 also includes 8' of flexible double column plastic tubing. Portable operation of the Model 25 is made possible by the use of the optional A-612 portable stand. A short piece of tubing can be slipped over the Model 25 pressure connections to contain the gage fluid in transit.
  The Model 40 contains two 4-1/2' lengths of clear plastic tubing, a plastic swing-out stand and leveling screw for portable operation. It also features convenient rapid shutoff pressure connections and integral overpressure safety traps.