200,000 umhos Standard-Accuracy at 25 deg C is ±0.25 micromhos for 1, 5, and 10 umhos solutions and ±0.25% for other solutions or the uncertainty shown on the certificate, whichever is greater.
conductivity tester, handheld device provides a qualitative visual indicator of the conductivity of different solutions, acids or salts, Two brass probes can be touched to a solid substance, or immersed in a liquid, to show conductivity on green LEDs