300-2.75D Differential Pressure Test Gauge


  • For routine test, laboratory, and production applications

Product features

  • Accurate and compact in size
  • Sensitive, yet rugged, convenient to use
  • Available in 18 standard ranges (including vacuum and compound ranges)
  • High differential pressure is applied to the capsule; low pressure to the case
  • Maximum static (case) pressure is 150 psig

Application Datasheet – Fill Out and Return for Most Accurate Quote


2¾” dial

Scale Length
7″ through one pointer revolution

-400″ H20 to 100 psi

0.33% of full scale

0.2% of full scale

Pressure element volume
2.5 cc for the range 0-10″ water;
2.0 cc for all other ranges

Case volume
179 cc

Maximum case pressure
150 psig

Maximum case leak rate
Will not exceed 0.64 x 10-5 std cc/sec or 0.0018 psi/hr

Case connection
⅛” female NPT pressure and static connections. Each has a built-in stainless steel filter and is located on the back of the case.

Case construction
Anodized aluminum with tempered-glass dial cover
Flush mounted by four screws through bezel

Materials exposed to measured gas
Pressure element: beryllium copper, brass, soft solder in ranges to 100″ water; silver and soft solder in ranges above 100″ water.

Case: aluminum, beryllium copper, brass, stainless steel, nylon, ethylene propylene rubber, soft solder, synthetic sapphire, white paint, drawing ink, lacquer.

Ranges above 100″ water have silver solder also.



  • Calibration in most metric units is available at no extra cost
  • Other units of calibration are available at extra cost
  • Excess pressure relief valves to 100 psi are available at extra charge


Weight and shipping weight
Approx. 2 lbs.

Ordering Information
When ordering, please specify ordering number, range, and mounting angle. (Extra cost if mounting angle is other than vertical).

Note: This gauge should not be used for corrosive gases or for liquids of any kind.