A medical testing apparatus comprising a body part and a handle part connected together, the body part forming a reflex hammer having an impact surface, the medical testing apparatus further comprising: a medical testing instrument (4, 5) which is electrically operable for medical testing; a control unit in electrical communication with a power source and with the medical testing instrument (4, 5); and a motion sensor provided in connection with said control unit, the motion sensor forming a switch to the medical testing instrument (4, 5) such that the motion sensor is arranged to provide a first operating signal to the medical testing instrument (4, 5) to switch on the medical testing instrument (4, 5) for medical testing and a second operating signal to the medical testing instrument (4, 5) to switch off the medical testing instrument (4, 5), the medical testing apparatus comprises: - a first axis (x) defining a first operating direction of the medical testing apparatus which is the direction into which the reflex hammer is used; or - a first axis (x) through the body part, the first axis (x) extending between a first end having the impact surface of the reflex hammer and a second end which is opposite to the first end, the first axis (x) defines a first operating direction of the medical testing apparatus; the medical testing apparatus comprising the motion sensor which is arranged to provide the first operating signal to the medical testing instrument (4, 5) in response to a first movement of the medical testing apparatus other than the movement along the first axis (x) of the medical testing apparatus, and the second operating signal in response to a second movement of the medical testing apparatus other than the movement along the first axis (x) of the medical testing apparatus, the medical testing instrument (4, 5) is a stethoscope having an operational surface for medically testing a human body, the stethoscope comprising a microphone for amplifying sound coming from said human body and a transmitter for transferring the sound from the microphone to a separate receiver. a medical testing instrument (4, 5) which is electrically operable for medical testing; a control unit in electrical communication with a power source and with the medical testing instrument (4, 5); and a motion sensor provided in connection with said control unit, the motion sensor forming a switch to the medical testing instrument (4, 5) such that the motion sensor is arranged to provide a first operating signal to the medical testing instrument (4, 5) to switch on the medical testing instrument (4, 5) for medical testing and a second operating signal to the medical testing instrument (4, 5) to switch off the medical testing instrument (4, 5), the medical testing apparatus comprises: - a first axis (x) defining a first operating direction of the medical testing apparatus which is the direction into which the reflex hammer is used; or - a first axis (x) through the body part, the first axis (x) extending between a first end having the impact surface of the reflex hammer and a second end which is opposite to the first end, the first axis (x) defines a first operating direction of the medical testing apparatus; - a first axis (x) defining a first operating direction of the medical testing apparatus which is the direction into which the reflex hammer is used; or - a first axis (x) through the body part, the first axis (x) extending between a first end having the impact surface of the reflex hammer and a second end which is opposite to the first end, the first axis (x) defines a first operating direction of the medical testing apparatus; the medical testing apparatus comprising the motion sensor which is arranged to provide the first operating signal to the medical testing instrument (4, 5) in response to a first movement of the medical testing apparatus other than the movement along the first axis (x) of the medical testing apparatus, and the second operating signal in response to a second movement of the medical testing apparatus other than the movement along the first axis (x) of the medical testing apparatus, the medical testing instrument (4, 5) is a stethoscope having an operational surface for medically testing a human body, the stethoscope comprising a microphone for amplifying sound coming from said human body and a transmitter for transferring the sound from the microphone to a separate receiver.