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Ralston Field Gauge LC20

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Price: From $694.60 to $1,068.34
Manufacturer: Ralston Instruments

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Ralston Field Gauge LC20

The Field Gauge LC20 has all the toughness and portability of our LC10 model, but with an impressive ± 0.1% of full scale accuracy. It’s the reference-grade gauge you can take with you anywhere. Perform logging and live viewing of pressure over USB, or choose the wireless option and monitor tests from the comfort of your truck.

Built for the Field
  • Large, easy-to-read display with intuitive controls and bright backlight
  • Tough powder coated aluminum exterior that withstands abuse and cracking and keeps the internal components functioning with extreme precision, even in extreme conditions
  • Waterproof up to 1 meter (IP67)
  • Made in the USA

Fast, Accurate, and Easy to Use
  • ± 0.1% full scale accuracy (ASME B40.100 Grade 4A/ISO Class 0.1)
  • Quick, reliable Zero function using a single button
  • Convenient High / Low readings maintained with quick reset for monitoring peaks and valleys

It's all about the Options
  • 15 engineering units to choose from
  • Option to add custom engineering units using the included FieldLab software
  • Available in 11 pressure ranges from 5 psi / 35 kPa to 10,000 psi / 70 Mpa, a compound vacuum/pressure gauge from -/+15 psi, and a digital vacuum gauge measuring up to 30 inHg / 760 mbar
  • Connect to a PC via USB or wireless to change settings or to perform data logging.

The Right Tool for the Task
  • General pressure monitoring
  • Calibration of analog pressure gauges and transmitters
  • Pressure switch testing (need a multimeter to measure switch closure)
  • Leak testing

Model Options Datasheets:


Included with NON-Wireless Models:
  • USB-A to Micro USB-B cable, 2m long
  • Calibration certificate for Field Gauge NIST traceable
Included with Wireless Models:
  • USB-A to Micro USB-B cable, 2m long
  • Calibration certificate for Field Gauge NIST traceable
  • USB Dongle for connecting Ralston FieldLab and Field Gauges to a PC
  • Tilt Antenna for LC20 with W1 Radios
Included with Bluetooth Models:

  • USB-A to Micro USB-B cable, 2m long
  • Tilt Antenna for LC20 devices with Bluetooth Radios
  • ISO 17025:2017 Accredited Calibration certificate for Field Gauges
LC20 Specifications
Max Pressure 5 PSI / 34 mbar / 30 kPa
15 PSI / 1 bar / 100 kPa
30 PSI / 2 bar / 200 kPa
50 PSI / 3.5 bar / 350 kPa
100 PSI / 7 bar / 700 kPa
300 PSI / 20 bar / 2.00 MPa
500 PSI / 35 bar / 3.50 MPa
1000 PSI / 70 bar / 7.00 MPa
3000 PSI / 200 bar / 20 MPa
5000 PSI / 350 bar / 35 MPa
10000 PSI / 700 bar / 70 MPa
Accuracy - Pressure Measurement +/- 0.1% of Full Scale (ASME B40.100 Grade 4A/ISO Class 0.1)
Measurement Type Gauge Pressure
Gauge Pressure, Gauge Vacuum
Gauge Vacuum
Min Operating Temperature -4 °F / -20 °C
Max Operating Temperature 122 °F / 50 °C
Materials ABS / Polycarbonate Blend, Powder Coated Aluminum
Calibration Certificate NIST traceable (included)
Certifications Certified to CSA Standard C22.2 No. 61010-1, Complies with Pressure Equipment Directive 2014/68/EU, Complies with Low Voltage Directive 2014/35/EU, Complies with Electromagnetic Compatibility Directive 2014/30/EU
Ingress Protection IP67 (1 meter water submersion for 30 minutes)
Wetted Materials 316 Stainless Steel
USB Connection USB (Micro B)
Media Compatibility Inert Gas, Natural Gas, Petroleum Based Oil, Water, Air
Inert Gas, Natural Gas, Petroleum Based Oil, Water, Air, Alcohol, Antifreeze, Ethylene Glycol, Hydraulic Oil, Mineral Oil, Skydrol, Windshield washer fluid, Transmission fluid, Light motor oil, Ralston Calibration Oil
Primary Power Battery Power
Battery Type AA Alkaline (IEC-LR6)
Battery Count 2
Battery Life 1000 Hours
LCD Display 2.4 in / 61 mm segmented LCD Display
Wrench Size 7/8 In / 23 mm
Length 1.75 in / 45 mm
Width 3.4 in / 87 mm
Height 4.1 in / 11 cm
Weight 12.6 oz / 355 grams
Country of origin USA



Field Gauge Software is a free Windows application and can be downloaded for use with any Field Gauge.
Field Lab Desktop 1.32.2