Air Ions
 $390 Air Ion Counter Independently measures the number of positive and negative ions/cc in the air. |
 $290 Surface DC Voltmeter Measures the static charge on surfaces without contact. Sensitivity is 1V @ 1” (range 30kV). |
 $570 Ultra Stable Surface DC Voltmeter Measures static charge on surface with extreme sensitivity (down to 0.1 V at 1”) |
