REED R7900 Ultrasonic Thickness Gauge


Internal memory capable or storing up to 500 readings with user alarm thickness limits.

REED R7900 Offers

This ultrasonic thickness gauge has a backlit LCD display and is capable of measuring the thickness of a wide variety of ultrasonic conductive materials. The R7900 features user adjustable high/low alarms and internal memory capable of storing up to 500 measurements.


  • Measures a wide range of material including; metals, plastic, ceramics, composites, epoxies, glass, and other ultrasonic conductive materials
  • Easy-to-read backlit LCD display
  • User selectable unit of measure (in/mm)
  • Internal memory stores up to 500 measurements
  • Displays sound velocity at the touch of a button
  • Zero adjustment button
  • User adjustable High/Low alarms
  • Built-in two-point calibration function
  • Auto sleep, shut off and low battery indicator

REED R7900 Specifications

Measuring Range 0.03 to 15.7" (0.65 to 400mm)

Accuracy ±0.04mm (< 10mm)

±(0.1% rdg.+ 0.04mm) (< 100mm)

±(0.3% rdg.) (> 100mm)

Resolution 0.01mm or 0.1mm (< 100mm)

0.1mm (>100mm)

Velocity Range 1000 to 9999 m/s (0.039 to 0.394 in/µs)

Compatible Materials Ultrasonic conductive materials (ie. metals, plastics, ceramics, composites, epoxies, glass)

Sampling Time Less than 1 sec.

Display 4-Digit, LCD

Backlit Display Yes

Probe Length 3' (36")

Internal Memory Yes (up to 500 readings, 5 files up to 100 each)

Low Battery Indicator Yes

Power Supply 2 AA Batteries

Battery Life Approx. 100 hours (Alkaline)

Product Certifications CE

Operating Temperature 32 to 122°F (0 to 50°C)

Storage Temperature -4 to 140°F (-20 to 60°C)

Operating Humidity Range 20 to 80%

Dimensions 5.9 x 2.9 x 1.3" (150 x 74 x 32mm)

Weight 8.4oz (238g)

What's included with the REED R7900

  • Ultrasonic Thickness Gauge
  • Ultrasonic Couplant Gel
  • Probe
  • Hard Carrying Case
  • Batteries

Ideal Applications for the REED R7900

  • Monitoring and verifying pipes and pressure vessels
  • Industrial manufacturing