DT-107A (LED) Tachometer

DT-107ASeries DT-107A (LED) Contact Tachometers

The Series DT-107A Tachometer with microprocessor technology has heralded a superior standard in tachometer accuracy and capabilities for measuring and recording speeds of rotational, linear and surface plus total length. Offering unprecedented confidence, the DT-107A battery-operated tachometers feature the same rugged, high quality components that have made them the benchmark in the industry. These user-friendly, value-packed units feature memory storage; quick adjustment units knob; length functions; retrieval of last, maximum and minimum values; plus each unit comes standard with a free N.I.S.T. certificate. Units are available with an LCD or vibrant red LED display.

Incorporating the precise technology and user-friendly functions as the DT-107A, the DT-107A-S12 provides an exceptional accuracy in measuring speed and length via its 12” wheel. The larger wheel rotates more slowly than a standard 6” wheel, enabling reliable and safe registration of high speeds.



  • Outstanding accuracy allows usage in the strictest applications
  • Exceptionally rugged die-cast aluminum housing enables usage in the harshest conditions
  • Wide field selection of units in both instantaneous rate as well as totalized length satisfies a multitude of user requirements
  • Large 5 digit display aids user visibility
  • Expansive 10 measurement memory capacity allows quick retrieval of stored data plus additional last, max. & min. values
  • Long-life battery (25-40 hrs. continuous use) eliminates concerns of being down during testing
  • Compact, ergonomic design allows easy grip
  • Rear threaded inserts provides option to mount to stand or other device
  • Available display options of either LCD or vibrant, bright red LED
  • CE Mark combined with free N.I.S.T. certificate provides peace of mind due to the quality of the instrument


Model DT-107A
Display Range 0.10 – 25,000RPM with floating decimal
Accuracy ±0.06 rpm: 0.10 – 999.9 rpm
±0.6 rpm: 1,000.0 – 9,999.9 rpm
±0.006% of reading ±1 digit (±2 rpm max.) 25,000 rpm
Display 5 digit 0.4” (10 mm) high LED
Measuring Units Revolution: RPH, RPM; Feet: FPH, FPM; Miles: MPH; Yards: YPH, YPM; Inches: IPM; Meters: mPH, mPM; Length: m, cm, inches, feet, yards; Total Revolutions: REV
Memory System 13 readings are stored in memory and retained for 5 minutes (last, max., min., and 10 extra measurements)
Detection Optical coupler, 60 pulses/rev.
Update Time 1 second (typical)
Over Range Indicator Flashing numerals
Power Requirement 2 AA 1.5V batteries (Life: Approx. 40 hrs.)
Operating Temperature 32° – 113° F (0° – 45° C)
Construction Die-cast aluminum housing
Dimensions 7.2” L x 2.4” W x 1.8” H (182.5 mm x 60 mm x 46 mm)
Product Weight 0.9 lb (400 g)
Package Weight Approx. 2 lb (.91 kg)
Approvals CE
Warranty 2-Year
Included Accessories Two AA Batteries, 2 cone adapters, funnel adapter, 3½” extension shaft, carrying case, NIST certificate, master wheel (6” cir.)
Options -S12 Option: Same as DT-107A except 6” circumference wheel replaced with 12” circumference contact wheel

Ordering Details

DT-107A LED Contact Tachometer with included 6” contact wheel. Includes NIST certificate
DT-107A-S12 LED Contact Tachometer with included 12” contact wheel. Includes NIST certificate.


CONE 1/2 inch cone adapter
CONE-3/4 3/4 inch cone adapter
CONE-1-1/4 1-1/4 inch cone adapter
DT-CARRY100 Carrying case for handheld tachometers
EXT-SHAFT 3.5 inch extension shaft for handheld tachometers
FPM-12 12 inch circumference measuring wheel
FPM-6 6 inch circumference measuring wheel
FPM-6-GV 6 inch circumference grooved measuring wheel
FUNNEL 1/2 inch funnel adapter
NIST-TACH NIST traceable certificate with data
-12-CBL For 12 inch circumference cable wheel
-12-KMW For 12 inch circumference aluminum knurled wheel


Literature Download:

DT-107A Data Sheet | DT-107A Manual | DT-107A-S12 Manual