ohmmeter, ammeter and voltmeter

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Across
  1. 4. not positive; less than zero.
  2. 6. tools or machines that do a particular job.
  3. 7. the information shown on a measuring instrument.
  4. 9. paying attention and avoiding mistakes.
  5. 12. a container with chemicals that produces electricity.
  6. 15. finding out how big, long, heavy, etc. something is.
  7. 17. a device used to measure electrical potential difference.
Down
  1. 1. a point where you can connect wires to a battery or other device.
  2. 2. a thin piece of metal that carries electricity.
  3. 3. a tool for measuring things like electricity or gas.
  4. 5. a device used to measure the flow of electric current in a circuit.
  5. 8. correctly or in the right way.
  6. 10. likely to harm or hurt someone.
  7. 11. a path for an electric current to flow around..
  8. 13. a tool used to measure electrical resistance.
  9. 14. a set of numbers or marks showing measurements.
  10. 16. good or useful; more than zero.