Cheapo digital volt meter more then capable for the job.
http://www.ebay.co.uk/itm/Digital-LCD-Mini-with-Buzzer-Ampere-Meter-Voltage-Test-Probe-DC-AC-Multimeter-/272141515843?hash=item3f5ce5fc43:g:6N4AAOSwBLlU~6qG
Same item sourced in uk on Ebay expect to pay double the price, works perfectly well.
When checking for polarity you simply set the dial to read volts and stick the probe ends on the battery connections (red to +, black to - ) if wired correctly you will get a plain voltage reading or if wired in reverse a minus will appear before the voltage reading. To confirm how this works try it with any battery (PP3, AA,AAA etc) correct way first then reverse your probes and you will see the minus appear before the v reading.
Once you get your meter we can guide you on the next steps on how to use it, such as above.
http://www.ebay.co.uk/itm/Digital-LCD-Mini-with-Buzzer-Ampere-Meter-Voltage-Test-Probe-DC-AC-Multimeter-/272141515843?hash=item3f5ce5fc43:g:6N4AAOSwBLlU~6qG
Same item sourced in uk on Ebay expect to pay double the price, works perfectly well.
When checking for polarity you simply set the dial to read volts and stick the probe ends on the battery connections (red to +, black to - ) if wired correctly you will get a plain voltage reading or if wired in reverse a minus will appear before the voltage reading. To confirm how this works try it with any battery (PP3, AA,AAA etc) correct way first then reverse your probes and you will see the minus appear before the v reading.
Once you get your meter we can guide you on the next steps on how to use it, such as above.
Last edited: