Digital Pressure Gauges & Test Gauges

Digital pressure gauges for field and lab work — Crystal, Additel, Ralston, and related instruments, with ISO/IEC 17025 accredited calibration available on most models.

What a pressure gauge does

A pressure gauge gives you a local reading of pressure at the point of measurement. Digital gauges, also called electronic pressure gauges, use a sensor and display so you can read resolution clearly, switch units, and (on many models) log data or send an output — useful for leak checks, calibration work, and process checks where an analog dial is hard to resolve.

Gauge, absolute, and differential

• Gauge pressure is referenced to atmosphere (most process readings).
• Absolute pressure is referenced to vacuum (includes atmospheric effects).
• Differential pressure compares two ports (filters, flow elements, DP tests).

Match the sensor type and range to the job; do not rely on a gauge past its rated pressure.

Choosing a digital gauge

• Range and accuracy — pick a range that covers the work with margin; tighter accuracy costs more and may need a piston/deadweight reference for cal.
• Output / logging — needed when you record as-found/as-left data or feed a recorder.
• Environment — intrinsically safe, weather sealing, and media compatibility when the process demands it.
• Process connection — NPT, sanitary, or quick-test adapters so the gauge connects cleanly to the UUT or process.

Brands we stock in this category

• Crystal (AMETEK) — XP2i / XP3i and related reference gauges for portable high-accuracy work.
• Additel — digital gauges across wide ranges, including IS and logging options.
• Ralston — field gauges and process meters that pair with Quick-test hoses and fittings.
• REED — manometers for lower-cost differential and HVAC-style checks.

Digital high pressure gauges

For hydraulic and high-pressure test work, where a digital hydraulic gauge replaces an analog dial, the Additel 681A digital pressure gauge is offered in gauge ranges up to 60,000 psi (4,200 bar). Per the Additel datasheet, accuracy by range is:

• up to 15,000 psi: 0.01%, 0.02% or 0.05% FS, or 0.1% of reading
• 20,000 to 40,000 psi: 0.05% FS (0.1% option)
• 50,000 and 60,000 psi: 0.1% FS (0.2% option)

The 681A also comes as an intrinsically safe version (681AEx), with Bluetooth and IP67 protection. To generate test pressure, see hydraulic and pneumatic hand pumps.

Popular digital pressure gauges

• Crystal — XP2i digital pressure test gauge (0.1% of reading, intrinsically safe, optional DataLoggerXP), XP2i-DP differential gauge, XP3i digital test gauge, m1 and m1M maritime gauges, and the panel-mount WT.
• Additel — 680A / 680P, 681A, 685, 686 advanced and 601Ex digital pressure gauges.
• Ralston — LC10 field gauge, LC20 field gauge, LC20 sanitary and LC30 process meter.

Related categories

Pair a gauge with pressure calibrators and pressure modules, generate test pressure with hand pumps, and connect with fittings and adapters and Quick-test hoses.

More models in this category

• Ralston Dual Pressure Field Gauge LC20
• Ralston Pressure / Temperature Field Gauge LC20: ±0.1% FS pressure, IEC 60751 Class A external temperature probe, 15 pressure units, IP67, ISO 17025 certificate.
• Ralston Temperature Probe Field Gauge LC20
• Ralston Dual Pressure Process Meter LC30
• Ralston LC30 Pressure / Temperature Process Meter
• REED R3002 Digital Manometer: measures gauge and differential pressure up to 5psi.
• REED R3030 Digital Manometer: measures gauge and differential pressure up to 30psi.
• REED R3100 Digital Manometer: measures gauge and differential pressure up to 100psi.

Accessories for the REED R3300 refrigerant system: add-on and replacement parts for existing R3300 digital manifold users: REED R3300-PG Wireless Pressure Gauge, REED R3300-VAC Wireless Vacuum Gauge, REED R3300-PROBE Wireless Temperature Probe, REED R3300-TEMP Temperature Clamp for R3300-PG and REED R3300-HOSE Refrigerant Hose Set (blue, yellow, red).

Frequently asked questions

Which digital pressure gauges read absolute pressure?

For a digital absolute pressure gauge, choose the Additel 685 or 686. Each has a built-in barometer, so one unit reads gauge, absolute and barometric pressure.

What is the highest-pressure digital gauge you carry?

The Additel 681A, 685 and 686 are offered in ranges to 60,000 psi. The 681A's top ranges (50,000 and 60,000 psi) are rated 0.1% FS, with a 0.2% option.

Which digital pressure gauge is the most accurate?

For a high accuracy pressure gauge, the Additel 685 offers accuracy to 0.01% FS, and the 681A offers 0.01% FS on ranges up to 15,000 psi. The Crystal XP3i is 0.05% of reading. The Crystal XP2i is 0.1% of reading, with 0.02% and 0.05% of full scale options.

Which digital pressure gauges are intrinsically safe?

The Crystal XP2i, XP2i-DP and XP3i; the Additel 601Ex (ATEX/IECEx Ex ia IIC T4 Ga); and the Ex versions of the Additel 680A, 681A and 685.

Which digital pressure gauges have a data logger?

For a data logging pressure gauge, choose one of these:

• Crystal XP2i and XP2i-DP: the optional DataLoggerXP records 32,000 points.
• Crystal XP3i: optional storage of more than 200 million points.
• Ralston LC10, LC20 and LC30: USB logging with FieldLab Desktop software.
• Additel 680A: data logging is available as an option.

Do your pressure gauges come calibrated?

Yes, many do. The Additel 680A, 681A, 685 and 686, the Crystal XP2i, XP2i-DP, XP3i, m1 and m1M, and the Ralston LC20 ship with an ISO 17025 accredited calibration certificate. The Additel 601Ex ships with a certificate of conformity (no data). Accredited calibration at your own test points is available at quote.

Which gauge should I use for differential pressure?

The Crystal XP2i-DP is a wet/wet differential test gauge. For lower pressures, the REED R3002, R3030 and R3100 digital manometers measure gauge and differential pressure up to 5, 30 and 100 psi.

Calibrated pressure gauges

Several digital gauges here ship as calibrated pressure gauges, with an ISO 17025 accredited calibration certificate in the box (per the OEM):

• Additel: 680A, 681A, 685 and 686, each with calibration data.
• Crystal: XP2i and XP2i-DP (NIST-traceable data), XP3i (data at five temperatures), and m1 / m1M (multi-temperature data).
• Ralston: LC20 field gauge.

Need a calibrated digital pressure gauge with your own test points? Most gauges here can also ship with ISO/IEC 17025 accredited calibration from Total Calibration Solutions, with the test data your quality system needs. Ask at quote or checkout if you need as-found data, specific test points, or a due date aligned to your program.