The PeakTech 3690 is a digital multimeter that combines the features of the most common four environmental measurement functions. With humidity and temperature measurement, it allows for the monitoring and recording of ambient temperatures that can influence the readings of some devices. This is achieved through the integrated sensor located at the top of the multimeter. Additionally, temperature measurement of surfaces, for example, can be performed using the included type-K thermocouple. The measurement of illumination intensity, expressed in lux, enables the user to determine the lighting levels of workspaces or room lighting. The sound level measurement function is useful in areas where there is a risk of excessive noise levels, but simple sound measurements can also be conducted with the device. The profile of the PeakTech 3690 is completed by standard multimeter functions such as voltage measurement, current measurement, resistance measurement, and many other features.