 | The model 156 instrument tests the efficiency of an air ionizer's ion production by measuring how long it takes to discharge a floating plate that has been precharged to either a positive or negative charge level. Mode selector switch for: +Decay, -Decay, or float mode. Voltage monitor output 3 1/2 digit LED dislay Test/Reset control Monitored voltage range: 0 to ±1100VDC or peak AC Plate self discharge: less than 12V/minute (unpolarized) Power: Rechargeable battery supplied9265.110: Charged-plate monitor without plate and AC adapter 9265.115: AC adapter, 90-260Vac 9265.120: 6"x6" plate |