Student Digital Joulemeter 
Suitable for KS4+. The Edu-Lab Student Joulemeter is designed specifically for student use. The unit can measure energy from 1 joule to 999,999 joules, with a typical accuracy of 99%. Power is by means of a 9V DC mains adaptor.
- Input voltage: 0V to 15V AC, or 0V to 21V DC (maximum).
- Maximum load current : 10A AC/DC.
- Circuitry : Microprocessor, combined with precision voltage multiplier.
- Built-in timing function, the start button starts timer and joulemeter together and at the same time starts powering up the load. The stop button stops the timer and joulemeter, and disconnects the input power from the load.
- Dimensions: 90 x 90 x33mm.
- Display: 2 x 16 character LCD.