Znalazłem na Aliexpress wśród innych tensometrów do pomiaru naciągu szprych https://www.aliexpress.com/popular/spoke-tension-meter.html produkt o symbolu ZTTO. W opisie podano: ZTTO Bicycle Tool Spoke Tension Meter    Material:Aluminum alloy CNC  Weight: About 200g   Measure the absolute tension of each of the spokes in a wheel. The TM-1 works on nearly any bicycle spoke. Used for building or truing wheels, diagnosing wheel problems, or assemblin