There only seems to be a zero trim for that meter so the only calibration you could do is to short the leads and adjust for zero. You can check the calibration on most ESR meters by measuring resistors instead of capacitors. Use 2% or 1% types. Lee. ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________