Materials Testing
    Contact & Non-Contact Tachometers

Contact & Non-Contact Tachometers

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Why buy from Geneq? - find out more

The DT-205LR & DT-207LR combine the best features found in both contact and non-contact tachometers for the accurate measurement of rpm, surface speed and length.

The screw-in contact adapter makes it quick & easy to convert from non-contact to contact operation.


  • Includes NIST Traceable calibration Certificate
  • High-precision laser measures from distances up to 14 feet
  • LCD Version for use in sunlight and for longest battery life
  • LED version for use in poorly lit or dark environments
  • Includes 6" circumference surface speed wheel
  • Built-in memory for last, maximum, minimum and 10 separate readings
  • DT-205LR NSN: 6680-01-378-6490


  • DT-205LR LCD Display with 6" Circum Measuring Wheel
  • DT-205LR-S12 LCD Display with 12" Circum Measuring Wheel
  • DT-207LR LED Display with 6" Circum Measuring Wheel
  • DT-207LR-S12 LED Display with 12" Circum Measuring Wheel

Complete Kit

All models are supplied as a complete kit including the tachometer, reflective tape, screw-in contact adapter, 2 cone tips, funnel tip, shaft extension, surface speed wheel, two AA batteries, NIST Traceable calibration Certificate and operating manual - all supplied in a foam-fitted carrying case. 

Note: On DT-205LR-12 and DT-207LR-12 models 12" circumference wheel is supplied instead of 6" version

Measuring RangeNon-Contact - 6 to 99,999 rpm
Contact - 0.8 to 25,000 rpm
Accuracy6 to 8,299 rpm: ±1 rpm
8,300 to 24,999 rpm: ±2 rpm
25,000 to 99,999 rpm: ± 6 rpm max.
DisplayDT-205LR: (LCD MODEL) 5 digit 0.47" (12mm) high
DT-207LR: (LED MODEL) 5 digit 0.4" (10mm) high
Measurement UnitsPer Second: Inches, Centimeters (optional, inquire)
Per Minute: Revolutions, Inches, Feet, Yards, Meters
Per Hour: 
Miles, Kilometers (optional, inquire)
Total: Revolutions, Inches, Feet, Yards, Centimeter, Meters
Measuring Distance14 feet (4.2 m) maximum
DetectionLaser Diode, Class II
Memory13 readings are stored in memory and retained for 5 minutes
(last, max., min., and 10 measurements)
Over-Range IndicatorFlashing numerals
Update Time1 second (typical)
Batteries2 - 1.5 V AA
Battery LifeDT-205LR Approx 40 hrs
DT-207LR Approx 25 hrs
Low Voltage IndicatorDT-205LR Flashing "LO BAT" display
DT-207LR "B" display
Operating Temp32 to 113° F (0 to 45° C)
ConstructionDie-cast aluminum housing
Weight0.8 pounds (365 grams)
Dimensions6.6" L x 2.4" W x 1.8" H (167mm x 61mm x 45.7)
Warranty2 years