The short answer
Shaft you can touch, or belts and rollers to measure in m/min: the contact HTM 590. Guarded, small, hot or very fast shafts: the non-contact HTM 560, which reads up to 1,00,000 RPM. Mixed work and you want one tool: the HTM 890 with a contact side and a photo side.
What a tachometer tells you
A tachometer measures how fast something turns, in revolutions per minute (RPM). It is the quickest way to check that a motor, fan, pump or spindle is running at the speed it should. A motor that is slower than its nameplate under load, a belt that is slipping or a fan that is running fast all show up on a tachometer before they show up as a failure.
Contact or non-contact?
A contact tachometer presses a rubber tip against the end of the shaft. A non-contact (photo) tachometer reads a strip of reflective tape from a distance with a light beam. Neither is better in every case, so choose by the job.
| Contact (HTM 590) | Non-contact (HTM 560) | Combined (HTM 890) | |
|---|---|---|---|
| How it reads | Rubber tip on the shaft | Beam on reflective tape | Both, in one body |
| RPM range | 60 to 50,000 | 60 to 1,00,000 | 60 to 50,000 contact, 60 to 1,00,000 photo |
| Surface speed | 6 to 5000 m/min | Not measured | 6 to 5000 m/min |
| Working distance | Touching | 75 to 300 mm | 75 to 300 mm on the photo side |
| Best for | Motors, fans, belts, rollers | Guarded, small or fast shafts | Varied work, one tool |
What all three share
- Quartz crystal time base with 0.05% + 1 digit accuracy.
- 5-digit, 10 mm red LED display.
- Resolution of 0.1 RPM up to 1000 RPM, then 1 RPM.
- Last, maximum and minimum readings stored automatically.
- Four AA batteries with auto shut-off, and a padded carrying case.
Do you need surface speed?
Belts, conveyors, rollers, paper and textile lines are specified in metres per minute rather than RPM. Only the contact models read that: fit the peripheral (wheel) tip and the display shows m/min directly. The HTM 560 reads RPM only.
Safety
Our picks
Contact, with surface speed
HTM 590
Contact Type Digital Tachometer
60 to 50,000 RPM and 6 to 5000 m/min, with cone, cup and wheel tips supplied.
₹3,570
₹8,380 57% off
Non-contact
HTM 560
Non-Contact Type Digital Tachometer
60 to 1,00,000 RPM from 75 to 300 mm away. Nothing touches the machine.
₹3,190
₹7,320 56% off
Contact and photo in one
HTM 890
Photo Contact Digital Tachometer
Both measuring methods in one body, plus surface speed.
₹4,460
₹9,790 54% off
Which tachometer is best for measuring motor RPM?
For a motor with an accessible shaft end, the HTM 590 is simple and accurate. If the shaft is guarded or you want to stay clear of it, use the HTM 560 with reflective tape, or the HTM 890 for both.
Can a tachometer measure belt or conveyor speed?
Yes, a contact tachometer with the wheel tip reads surface speed in m/min. The HTM 590 and HTM 890 read 6 to 5000 m/min.
What is the accuracy of these tachometers?
All three are 0.05% + 1 digit with a quartz crystal time base.
Do I get a GST invoice?
Yes. Add your GSTIN at checkout and you receive a GST tax invoice.
