We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Amprobe TACH-20 digital tachometer in grey plastic housing with LCD display and contact tip

Amprobe

Amprobe TACH-20 tachometer 1 to 19,999 rpm measurement tool

SKU CH-9Q9B-35NBQ

Measures 1 to 19,999 rpm contact and up to 99,999 rpm non-contact with 0.02% accuracy

  • TypeDigital Multimeters
  • Measures up to 19,999 RPM contact speed
  • Reads up to 99,999 RPM without contact
  • Accuracy within 0.02 % of reading
  • Resolution of 1 RPM across the range
  • Includes carrying case, reflective tapes and batteries

Amprobe TACH-20 tachometer for RPM measurement

The Amprobe TACH-20 is a digital test instrument for measuring rotational speed from 1 to 19,999 RPM in contact mode and up to 99,999 RPM in non-contact mode. It suits technicians who need to verify motor, shaft or conveyor speeds in maintenance and automotive settings. Accuracy is rated at ±0.02% of reading ±1 digit with 1 RPM resolution. The kit includes a carrying case, reflective tapes and batteries.

Installation and common issues

Non-contact measurement works at distances between 4 and 12 inches when reflective tape is applied to the rotating surface. Contact measurement uses the supplied adapter pressed against the shaft centre. Readings become unstable if the tape is dirty, misaligned or the sensor angle drifts beyond the specified range. Low battery voltage can also cause erratic digits before the low-power indicator appears.

Behaviour under sustained load

The instrument updates the display once per second, so prolonged monitoring shows a stable average rather than a short burst peak. Extended contact sessions add mechanical drag on small shafts, which can lower the indicated RPM slightly compared with non-contact use. The internal circuitry maintains the stated accuracy across the full 1 to 19,999 RPM contact range during continuous operation.

Highlights

  • Measures up to 19,999 RPM contact speed
  • Reads up to 99,999 RPM without contact
  • Accuracy within 0.02 % of reading
  • Resolution of 1 RPM across the range
  • Includes carrying case, reflective tapes and batteries

Specifications

BrandAMPROBE
TypeDigital Multimeters

Questions about this item

How do I confirm the TACH-20 is measuring RPM within its stated accuracy after setup?

Point the sensor at the supplied reflective tape on a rotating shaft from 4 to 12 inches away and verify the display reads within ±0.02 % of reading ±1 digit of the known speed.

What accessories are included with the TACH-20 and what must be purchased separately?

The package includes a carrying case, reflective tapes and batteries; a calibration certificate is available as a separate purchase.

Which measurement range should I rely on for contact versus non-contact RPM readings on the TACH-20?

Use the contact mode for 1 to 19,999 RPM and the non-contact mode for 1 to 99,999 RPM, keeping the sensor 4 to 12 inches from the target.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.