Handheld Optical Tachometer

The Ono Sokki HT Series is a range of handheld tachometers, suited to the measurement and maintenance of machinery with rotating parts.

Ideal for:

  • Measuring the speed of rotating parts in machinery and/or vehicles
  • Maintenance of machinery/vehicles with rotating parts
In stock Yes No
Price was € (Inc. VAT) RRP € Price was € (Ex. VAT) RRP €

The HT Series of handheld tachometers from Ono Sokki are lightweight and compact digital tachometers that are available is both contact and non-contact variants. The HT-3200 in a contact-type tachometer offers a low measurement range that starts from 0.5r/min, and the HT4200 is a non-contact instrument that allows measurements to be taken from multiple measurement marks on at low rotation speeds. 

Ono Sokki is one of the world's leading manufacturers of this type of instrument and Eurolec are the UK and Ireland's sole distributor of their products.

Key features:


  • 5-digit display enables wide-ranging measurements to be taken
  • A large digital display
  • Lightweight and compact device that can be easily carried in a pocket
  • Built-in memory that stores recorded data
  • Battery replacement indicator as standard
Detection method Red visible ray photoelectric reflection method
Detection distance 20 to 300 mm
Display 5-digit LCD (10.5 mm character height), fixed measurement (r/min)
Measurement update date 1s automatic update (2s when the circumferential speed is lower than 60/number of reflective marks r/min)
Rotation speed measurement range Measurement resolution: 1 r/min
The affixing of multiple reflective marks enables measurement of lower rotation speeds.

Measurement speed --> Number of reflective marks
30 to 50,000 r/min --> 1
15 to 25,000 r/min --> 2
10 to 16,667 r/min --> 3
8 to 12,500 r/min --> 4
5 to 8,333 r/min --> 6
4 to 6,250 r/min --> 8
Circumferential speed measurement range N/A
Measurement accuracy (for HT 4200, when one reflective mark is used) 30 to 12,499 r/min speeds                              Within ±0.1 r/min
12,500 to 24,999 r/min speeds                       Within ±0.1 r/min
25,000 to 50,000 r/min speeds                       Within ±0.1 r/min
Measurement of the number of pulses The number of reflective marks used can be specified in order to perform measurement from lower rotation speeds.
Specifiable values: 1, 2, 3, 4, 6, 8 P/R
Memory function 10 data can be memorised
Data hold function Auto-power off when 30 seconds have elapsed after the end of a measurement
Low battery indication The "LOW" mark is displayed when the battery voltage falls below 3.3 V
Over-range display An "ERROR" mark is displayed
Power source Three AAA-type batteries (1.5 V)
Continuous measurement time: approx. 20 hours (when alkaline batteries are used, at 20°C)
Operating temperature 0 to +40°C
Storage temperature -10 to +55°C
Outer dimensions 62 (W) x 129 (L) x 26.4 (D) mm
Weight (including batteries) Approx. 130g

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