The Model 565 TRMS clamp-on leakage current meter is designed to measure leakage currents in ground conductors. It makes leakage current measurements up to 600 mA with up to 10-microamp resolution.

If your goal is to save on electricity, you must first measure the ac current flowing through your appliances. The formula for power is the product of the ac line voltage and the measured current.

This is a take-off on Mr. Marian’s “Simple Micro Ampere Meter Circuit” that utilizes active circuitry and an analog meter to make sensitive DC current measurements. A reader subsequently asked if it ...