I was checking my stray voltage in my tank today and it was .5 volts I dont know if this is high or acceptable. in millivolts it was - 501. when i unplugged my new chiller it went down to .25 volts but nothing else would make it go any lower I unplugged everything else and nothing would make it go lower. So what I am asking is would that amount be acceptable or do I need to get it lower and why would a brand new chiller running on a external pump add stray voltage?