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Model 65-120 Portable Pneumatic Calibrator

The "Wally Box" in a New Case

wika 65-120 The series 65-120 Pneumatic Calibrator provides high-degree accuracy for on-site testing and bench calibration service. This versatile portable unit combines precision measurement and durable construction in a compact unit that is capable of simulating, applying, holding, regulating and measuring both pressure and vacuum. The dial, all pressure connections, and the controls are panel-mounted for easy access.

The 65-120 uses a mechanical dial does not use any electrical power, making it suitable for use in Hazardous Areas.

Also searched as: 65120000, 65120

Data SheetOperating InstructionsRequest for Quote

65-120 in Older Style Case

Image of Model 65-120 pneumatic calibrator

Ask about our Factory Calibrated Units at $2,950.00
These are units in older style cases that have been checked out at the Wika factory and have current calibration certificate traceable to NIST. Quantities are limited. Case and Panels may show cosmetic damage.

Also can be used in working order, but uncalibrated, for an inexpensive training tool


0.066% of full scale
Scale length:
45" (1140mm) through two pointer revolutions
Dual scale calibrated -100 to 850" water and -3.6 to 30.6 psi
Ordering number:
To order the standard "Wally Box" Portable Pneumatic Calibrator, ask for 65-120-000
Range and calibration:
On the dial, the outer scale reads -100 to 0 to 850" of water with graduations every 1.0": the Inner scale reads -3.6 to 030.6 psi with graduations every 0.05 psi.
0.03% of full scale
0.01 of full scale
0.1% of full scale
Temperature Effect:
Maximum is 0.1 % of full scale per 10°C/50°F change from 23°C/73.4°F
Dial Diameter:
8 1/2" (215mm)
Gauge case:
Anodized aluminum with tempered-glass dial cover

Other Standard Ranges and Ordering Numbers


Capsule system volume:
6.9cc with pointer at zero; 8.6cc, at full scale
Case Volume:
3070 cc
Case Pressure:
35 psi (2.5 bar) maximum
Overpressure protection:
A pressure relief valve protects the mechanism (capsule); pressure up to 90 psi will not damage the mechanism nor affect accuracy. A built-in relief valve and a flow restrictor protect the case from pressures up to 10 times the case rating of 35 psig. This valve is an emergency-protective device only.
Maximum case leak rate:
Will not exceed 1.03 X 10-7 std cc/sec or 0.018 psi/hr
Materials exposed to measured gas:
Capsule system: Ni-Span ® soft solder, brass, 303 stainless steel, silver solder
Case system: Ni-Span C®, brass, phosphor bronze, beryllium copper, magnesium, aluminum, nylon, 303 stainless steel, Elgiloy, soft solder, silver solder, Hypalon.
Inlet manifold to pressure gauge: aluminum, brass, polyethylene, copper, steel, glass wool, carbon, Buna N.
Carrying Case:
ABS plastic 17-1/2" x 12" x 7-1/2" (445x305x190 mm)
6 adapters for 1/8° pipe thread to 114" plastic tubing, 20 ft of 1/4" OD plastic tubing, instruction book, sheet with summary of important instructions.
Other units of calibration, including metric (SI) units are available at an extra cost. Two sets of calibrations (dual scale) are available at an extra charge.
Shipping weight:
26 lbs. 20 lb.


For gauge pressure: Test pressure is applied to the capsule through the appropriate P connection; the case is open to atmosphere through S.
For differential pressure: High-test pressure is applied to the capsule through the appropriate "P" connection. Low test pressure is applied to the case through "S"
For absolute pressure: Test pressure is applied to the capsule through the appropriate P connection, and the case is continuously subjected to full vacuum through S.
For vacuum: The capsule is open to atmosphere through connection P; the case is connected to test vacuum at S.
For positive and negative pressures: Test pressure is applied to the capsule through the appropriate P connection, and the case is open to atmosphere through S.

Series 65-120 Portable Pneumatic Calibrator

Clear, Accurate Readout

Sharply defined graduations, a 45" scale length over two pointer revolutions, and a knife-edge pointer facilitate précis readouts. A computer-assisted plotter marks calibration points and the graduations between them on each dial.

Engineered for Performance

The gauge housing is heavy cast aluminum with a tempered glass dial cover. A built-in pressure-relief valve has a dumping capacity, which protects the case against overpressures to 10 times the maximum pressure rating. A separate pressure-relief valve protects the capsule mechanism. The gauge is mounted inside the carrying case on rubber-padded shock mounts. The carrying case is constructed of strong but lightweight molded ABS that flexes to absorb shock from impact.

Compact, Built for On-site Service

The Wika Portable Pneumatic Calibrator weighs only 20 Ib and is only slightly larger than an attaché case. The easy portability, simple set-up, and the versatile capabilities of this unit extend its usefulness for service in the field. Its portability saves the time and expense of shop calibration.

An Extra Measure of Accuracy

All Wika Portable Pneumatic Calibrator are subject to rigorous and extensive testing. Each has to perform at better than the rated accuracy 0.066% of full scale to be accepted. It's accurate enough to double as a shop standard.

Calibration Traceable to NIST.

Calibration is with primary standards, which are directly traceable to the National Institute of Standards and Technology.


The Series 65-120 Portable Pneumatic calibrator is a Pressure-Vacuum test stand wholly contained in a carrying case. The front panel accommodates the precision pressure gauge, all pressure connections, two air-regulator controls, and a selector valve. With the selector valve, three different test pressures can be applied individually to the gauge. A fourth selector setting vents the gauge to atmosphere.

The precision pressure gauge has a Ni-Span C®, capsule-type pressure element, which gives excellent temperature stability and speed of response. An almost frictionless mechanical linkage amplifies capsule movement and transmits it to the pointer. Although highly sensitive and accurate, the mechanism is built to withstand the handling normally associ­ated with on-site calibration of pneumatic instrumentation.

A filter on the air supply keeps oil and moisture out. Two regulators apply known pressures to the devices under test. The connection block has 1/8 inch female-pipe-threaded connections. Small gauges can be threaded directly into the block; or as with larger instruments, connected by flexible tubing.

The standard scale contains two sets of calibrations: -100 to 0 to 850 inches of water and -3.6 to 0 to 30.6 psi. Other ranges and units of calibration (from min. 0-4.5 psi to max. 0-100 psi) are available.

The "Wally Box" Portable Calibrator eliminates the need for special arrangements or external controls. The carrying case has a compartment for adapters, tubing, and other accessories; the case cover is easily removed. Complete information on the use of the calibrator is given in an instruction book. A schematic flow diagram on the panel shows the calibrator's connections at a glance.

Simplest use of the calibrator is to carry it to an on-stream gauge, indicator, or recorder. Calibration of such instruments can be quickly checked by making simple connections without taking the instrument out of service. Also, the calibrator can simulate the set and process-variable signals to a pneumatic control device and check its output. These three pressures can be read out and checked in any order and in rapid sequence. By evacuating the calibrator, absolute pressure measurements can be made.