A-400 Universal Resistance Checker

• Measures surface resistivity, surface resistance to ground
  and point to point resistance.
• Easy to use -supplied with 2 cables for point to point
  resistance check.
• Extended range of direct readings in ohms per square for
  surface resistivity measurements and in ohms for surface
  resistance to ground and point to point resistance.
• Portable and light - uses 9-volt battery.

For surface resistivity readings place the meter on the surface being tested
and press the center button labeled TEST. If the LED labeled 10⁶ illuminates,
the surface under test has surface resistivity of 10⁶ ohms per square or less.

If the LED labeled "insulative" illuminates, the surface under test has surface
resistivity greater that 10¹² ohms per square.

(Be sure the ground wire is not connected  through the ground jack when surface resistivity is measured.)