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The Bullseye Precision Gauge-531 is the Bullseye Vacuum Gauge that you trust with the upgraded Agilent 531 sensor

The Bullseye Precision Gauge-531 is a rugged and portable vacuum gauge, which features visual graphing to pinpoint problems in real time (leak, pump, outgas, stable). Includes a powerful magnet and kickstand to enable hands-free operation.

Benefits of Choosing the Upgraded Agilent 531 sensor option:

  • All metal, sturdy, structure
  • Used in applications requiring higher levels of accuracy
  • Vacuum Interface: 1/8″ NPT but can be easily adapted to KF
  • Total Range: of 1 millitorr to 760 Torr (continuous and monotonic from atmosphere down to 6 Torr)
  • Range with Accuracy: 10 millitorr (.001 Torr) to 6 Torr (1 x 10-3 mbar to to 7.99 mbar)
  • 15% accuracy
  • Electrically identical to Agilent 536 sensors
  • Note: for Rough vacuum range applications >6 Torr choose the Bullseye Piezo with 775i sensor

Bullseye Precision Gauge-531 Features

Portable and Precise

  • Rugged thermocouple vacuum gauge ideal for understanding: Leaks, Pump Downs, Out-gassing or Stable Systems
  • Includes a powerful magnet and kickstand to enable hands-free operation
  • Long battery life and versatility with 12 different measuring units (micron, Torr, Inches of Hg, kPa, Inches of H20, millitorr, mbar, Pa, PSIA, mm of Hg, bar, and mm of H2O)
  • Calibrated under actual vacuum against a NIST standard, if you need before and after data shipped with the Bluetooth Bullseye Gauge then add NIST certification to your order

Graphing and Analysis

  • Patented vacuum graphing displays vacuum and time data
  • Visual graphing right on the display that identifies current system status
  • Vacuum Analytics to quickly identify vacuum pressure trends
  • Graphical display for quick determination of vacuum level

Bullseye Precision Gauge-531 Applications

  • Vacuum pump testing
  • Baseline vacuum pump performance
  • Transformer dry-out
  • Schlenk line monitoring
  • Botanical oil processing
  • Distillations
  • Vacuum Process Monitoring

Watch this video of Tim Collins (DigiVac’s CEO) using the Bullseye Precision Gauge to instrument our vacuum pump down solution to verify function and safety. And this video overviews Bullseye’s use in understanding vacuum system function and performance.


User Manual Data Sheet Quick Start Guide Bullseye App Manual

For more documentation, please visit DigiVac’s folder.

Technical Specifications

Units Torr, mbar, bar, kPa, inHg, mm Hg, millitorr, microns, inches of water, PSI, Pa
1E-4 – 1000 Torr
Range with Accuracy .001-5 Torr
Sensor Type Agilent 531 NPT
Dimensions 6.2”H x 3.7”W x 1.3”D
Certifications ROHS and CE

Product Inquiry

Bullseye Precision Gauge-531
Bullseye Precision Gauge-531 | with upgraded Agilent 531 Sensor