A typical sign is to look at his/her tuning approach. A piano tuner without formal training will tune the piano note by note using an electronic tuning device. Some inexperienced tuners will claim that they tune by ear and only use their electronic tuning device for the first note A4, yet the device is left switched on during the tuning session.
Let op die klavierstemmer se benadering: ’n onervare stemmer sonder formele opleiding is meesal afhanklik van ’n elektroniese stemapparaat. Sommige onervare stemmers sal aanvoer dat hulle net die eerste noot A4 met die stemapparaat instem en verder op gehoor stem. Die stemapparaat bly ook soms aangeskakel tydens die stemproses.