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DT-105A Contact Tachometer with LCD display.
DT-107A Contact Tachometer with LED display.

The DT-105A DT-107A Contact Tachometers are superior standards in tachometer accuracy and capabilities
for measuring and recording rotational, linear, surface speeds and total length.
Offering unprecedented confidence, the DT-105A and DT-107A battery-operated tachometers still feature
the same rugged, high quality components that have made them the benchmark in the industry.
These user-friendly, value-packed tachometers feature expanded memory storage, added length functions
and many standard accessories. Available with LED or LCD displays.

DT-105A Contact Tachometer

Model  Description 
DT-105A  Tachometer (LCD) 6" circumference wheel
DT-107A  Tachometer (LED) 6" cir. wheel  
DT-105A DT-107A Contact Tachometers
Model  DT-105A / DT-107A 
Measuring Range  0.10 - 25,000 rpm 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 (or 2 rpm max.): 10,000 - 25,000 rpm 
Display  5 digit 0.47" (12 mm) high LCD 5 digit 0.4" (10 mm) high LED 
Measuring Unit  Revolutions: rph, rpm
Feet: fph, fpm
Miles: mph Inches: ipm
Meters: mPH, mPM
Length: m, cm, inches, feet, yards
Total Revolutions: rev 
Memory  13 readings stored in memory retained for 5 minutes
(last, max., min. and 10 extra measurements) 
Display Update Time  1 second (typical) 
Detection  Optical coupler, 60 pulses / rev. 
System Control  Single-chip C-MOS microprocessor 
Over Range Indicator  Flashing numerals 
Voltage Requirement  2 AA / 1.5 V Batteries 
Battery Life  45-60 hrs approx. / 25 hrs approx. (DT-107A) 
Weight  0.9 pound (400g) 
Dimensions  7.2""L x 2.4""W x 1.8""H (182.5 mm x 60 mm x 46 mm) 
Standard Accessories  2 cone adapters, funnel adapter, 3-1/2" extension shaft, NIST
certificate, carrying case, master wheel (6" cir.)