Wireless voltage sensor

The wireless voltage sensor is designed for exploring the basic principles of electricity. With a wide input voltage range of – 15 to +15 V this sensor can be used to measure voltages in AC and DC circuits. The sensor is equipped with two 4-mm wires with banana plugs and alligator clips. The sensor has differential inputs, which means that measurements can be done directly across circuit elements without the constraints of common grounding. It can be used to measure positive potentials, as well as negative potentials.


The sensor is equipped with an OLED color display which shows some sensor information and the measured by the sensor values. This makes the sensor suitable to use as an independent measuring instrument. The thermocouple sensor can be used wirelessly via Bluetooth or wired via USB with the Coach 7 or Coach 7 lite programs/apps on computers (Windows and Mac), Chromebooks and mobile devices (Android and iOS).
CAUTION: NEVER use high voltages or household AC.

Technical specifications:

• Measuring range: -15 .. +15 V (differential)
• Resolution: 0.002 V
• Warrantee: 36 months
• OLED display: 0.96” 128 x 64px
• Max. voltage protection ± 30 V
• Input impedance: 5.3 ± 1.5% MO at 25°C
• Maximal sampling rate: 100 Hz (1000 Hz with USB cable)
• Battery life: 12h when full (rechargeable)
• Connection: Bluetooth 5, Low Energy (Mac, Android, iOS) Bluetooth 2.1, Classic (Windows) or USB-C 2.0

Technical specifications of the sensor are descibed it its User's guide.

Suggested physics experiments:

• Charging and discharging capacitors
• Characteristics of a light bulb and a diode
• Measurements of internal resistance and EMF
• Measurements in series and parallel electrical circuits
• Together with a current sensor, it can be used to explore the relationship between the current and the voltage in electrical circuits (Ohm's law)