I skimped out and bought a $20 multimeter - it's now one of my best toolkit investments

The Neoteck 3-in-1 pen multimeter is a great choice for DIYers and amateur tinkerers, especially at its price.
blog.lib.umn.edu

How to select and use a pH meter to test cottage foods

The final (equilibrium) of acidic and acidified foods must be 4.60 or less. Calibrate your pH meter before testing foods. Prepare and test 2 to 3 samples to ensure an accurate pH value. Using a pH ...

I tested 3 simple energy-monitoring tools to find my home's biggest power drains

Using the ATX 9801 is easy -- plug one end into a mains outlet, and it acts like a short extension lead with a digital display. The socket on the front accepts pretty much every power plug worldwide, ...
IEEE

Transmission Expansion Planning Test System for AC/DC Hybrid Grid With High Variable Renewable Energy Penetration

Abstract: Test systems are important tools and benchmark for power system research. Currently, there is a lack of standard test systems for modern transmission expansion planning (TEP) research, ...
IEEE

A proposition on test circuit structures using selectively metal-covered transistors for a laser irradiation failure analysis

Abstract: A quick and easy laser experiment for photocurrent induced failure investigations has been described. In order to focus a laser beam on a desired transistor in complex LSI circuits, novel ...