The compact Extech 250 allows users to quickly check for the presence of live wires in tight locations with a built-in voltage detector.
The Extech 250 has compact size that allows its user to quickly check for live wires small areas. Multimeter functions include AC/DC voltage, resistance, capacitance, frequency, temperature, duty cycle, diode, and continuity. The meter has a 1.2" (30 mm) jaw opening for conductors up to 500 MCM. Other features include a built-in non-contact voltage detector with an LED alert, auto power off to conserve battery life, and a relative mode for capacitance zero.
|Image||Part #||Product Description||Price||Stock||Order|
|MA250||200A AC clamp meter + NCV||
|Usually ships in 1-2 weeks|
|MA250-NIST||200A AC clamp meter + NCV, NIST traceable||
Usually ships in 1-2 weeks
Since the 1980s, scientists from the Vermont Department of Environmental Conservation (VT DEC) have been sampling water from acid-impaired ponds and lakes and tracking data related to acidity. The line of inquiry began in response to concerns about acid rain, but DEC scientists now find that the long-term monitoring is not only proving the efficacy of the Clean Air Act but also improving local water quality.
Guarding the environment in Vermont
Rebecca Harvey is a VT DEC scientist, and monitoring the state's waterways for acidity and other problems falls in part to her. Dr. Harvey corresponded with EM about this work.Read More
In the ongoing quest for better wastewater treatment, a team of researchers from the University of California, Riverside (UCR) have developed a technique to improve the way Advanced Oxidation Processes (AOPs) remove pollutants from wastewater dramatically. AOPs remove organic materials from water using oxidation.
These AOP reactions take place when hydrogen peroxide, a powerful oxidizing agent, decomposes, leaving hydroxyl radicals along with oxygen and water behind. This makes the processes appealing, but until now they've required both a long period of time and large amounts of both hydrogen peroxide and ferrous salt (Fe2+, a divalent iron ion). The Fe2+ acts like a catalyst, but also produces a secondary pollutant in the form of an iron-containing sludge.Read More
Wetlands are one of nature's plans for treating water. Home to a host of different microbes, riparian wetland soils play matchmaker to nutrient-rich runoff and bacteria that feast on nutrients and other environmental toxins.
Princeton University researchers have discovered one such bacterium—Acidimicrobiaceae bacterium A6—that can break down ammonium, part of both fertilizer and sewage runoff, without oxygen. This ability could mean wastewater treatment without expensive aeration machinery. Peter Jaffé , Princeton's William L. Knapp '47 Professor of Civil Engineering and a professor at Princeton's Andlinger Center for Energy and the Environment , corresponded with EM about the latest research .
Dr. Jaffé and his team first published on A6 in 2015.Read More