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Klein Tools RT310 AFCI and GFCI outlet tester verifying correct wiring and energized status in a wall receptacle
Field verification of proper outlet wiring using the Klein Tools RT310 circuit tester.

Author Profile: Mark Woods

Lead Field Engineer and Reviewer, AZ Testers

Mark Woods is the professional pen name of our lead field engineer. Based in Arizona and holding an MBA, he brings a unique blend of business management and field expertise to AZ Testers. With over three decades of experience working directly with major test equipment manufacturers, he uses a pseudonym to maintain operational privacy while sharing unfiltered, hands on industry reviews.

Experience and Expertise

Mark brings over 30 years of hands on industry experience specializing in diagnostic equipment for the HVAC/R, electrical, datacom, telecom, and industrial maintenance trades. Throughout his career, he has worked closely with major test equipment manufacturers and wholesale distributors. He understands the engineering behind the tools and has extensive experience training both sales personnel and field service technicians on their proper application.

The Tech in the Truck Philosophy

At AZ Testers, Mark evaluates tools through a strictly pragmatic lens. While laboratory specifications and bench test accuracies are important, his reviews focus entirely on what happens on the job site. He tests equipment for real world durability, speed of use, and practical ergonomics. He prioritizes factors like whether a clamp meter dial can be easily operated while wearing heavy work gloves, or if a combustion analyzer screen remains readable in a poorly lit, sweltering utility closet.

Member for

13 years 6 months

Articles Authored by Mark Woods

HVAC
Anemometers

Dust Free Active Air Purifier Review

By:
Mark
•
Created:
25 September 2026
•
Modified:
12 November 2026

Indoor Air Quality is becoming an area of increasing focus for health experts and most now agree that one of the best things we can do for our health is to maintain good air quality when we are inside. The science confirms that air quality inside is often worse than in the ambient air...

READ MORE →
Dust Free Active Air Purifier
General Pipe Cleaners
Inspection
Visual Inspection Cameras

Gen-Eye SD SL-SD-B Pipe Inspection Camera Review

By:
Mark
•
Created:
25 September 2026
•
Modified:
25 September 2026

When it comes to sewer pipe inspection there are many options out there. Today I will be reviewing the General Pipe Cleaners Gen-Eye SD SL-SD-B Pipe Inspection Camera System. This system is designed for pipes with a diameter between 3” - 10”. Other features of this system include the large 10.4” screen and a waterproof keyboard protected with a Heavy Duty Pelican case to work in any condition you might run up against. The Gen-Eye SD SL-SD-B Inspection System can record video, saving it to a SD card, and has a on screen distance counter and a date and time stamp to document the work.

READ MORE →
Gen-Eye SD SL-SD-B Pipe Inspection Camera
General Pipe Cleaners
Inspection
Visual Inspection Cameras

Gen-Eye Mini-Pod Review - The Pipe and Sewer Inspection Camera

By:
Mark
•
Created:
24 September 2026
•
Modified:
25 September 2026

This week we’re going to have a look at the General Pipe Cleaners Gen-Eye Mini-Pod inspection camera system for troubleshooting drains and piping. I’ll give you a brief rundown of the features and then talk about using a Gen-Eye system here at the office during a demo presentation.

READ MORE →
Gen-Eye Mini-Pod Sewer Inspection Camera
Amprobe
HVAC
Combustible Gas Detectors

Amprobe GSD600 Gas Leak Detector for Methane and Propane Detection Review

By:
Mark
•
Created:
14 September 2026
•
Modified:
12 November 2026

The Amprobe GSD600 Gas Leak Detector is a compact, high-sensitivity sniffer designed for residential HVAC technicians, gas fitters, and commercial maintenance mechanics. Built to detect combustible gases like methane, propane, and natural gas down to 35 ppm. With a fast warm-up cycle, a multi-LED visual concentration display, an audible tick rate indicator, and a standard earphone jack for loud mechanical rooms, the GSD600 provides quick, pin-point leak isolation on black iron pipe and appliance connections...

READ MORE →
Amprobe GSD600 Gas Leak Detector for Methane and Propane Detection
Flir
Inspection
Thermal Imagers

Flir C3 Infrared Camera Review

By:
Mark
•
Created:
14 September 2026
•
Modified:
14 September 2026

The Flir C3 is no longer in production.

READ MORE →
Flir C3 Infrared Camera
Seitron
HVAC
Carbon Monoxide Analyzer

Seitron Be Safe CO Detector Review: Essential Personal Protection for HVAC & Boiler Techs

By:
Mark
•
Created:
25 August 2026
•
Modified:
24 October 2026

1. Executive Summary

READ MORE →
Seitron Be Safe Personal CO Monitor
TSI Alnor
HVAC
Balometers

You Can Upgrade Alnor EBT721 to new EBT731

By:
Mark
•
Created:
20 May 2013
•
Modified:
24 September 2026

New balometer from Alnor gives you many cool features, such as detachable digital micromanometer (product main testing panel) with intuitive menus, Bluetooth bi-directional communications, built-in duct traverse applications and many plug-and-play optional probes.  It comes also with multi-language capability, so you can show off your skills, when you meet you buddies.  All those great features and detachable digital micromanometer are available to proud owners of EBT721, and older version of Alnor balometer.  Guys all you need to do is to participate in Alnor’s upgrade progr

READ MORE →
Upgrade Alnor EBT721 to new EBT731 Balometer
Yellow Jacket
HVAC
AC Vacuum Pumps

Yellow Jacket AC Vacuum Pumps Review - HVAC Pumps Made in USA

By:
Mark
•
Created:
18 May 2013
•
Modified:
24 September 2026

Many HVAC techs still wonder if any vacuum pumps are made in USA.  The answer is YES.  Yellow Jacket makes two different product series: SuperEvac and Bullet, and both types of vacuum pumps are made in USA.  SuperEvac comes in 4, 6, 8 and 11 CFM capacity, and it is a premium vacuum pump.

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Yellow Jacket AC Vacuum Pumps made in the USA
Amprobe
Electrical
Circuit Wire Tracers

Amprobe AT-2005 Wire Tracer for Tracing Wires in Metalic Conduits

By:
Mark
•
Created:
18 May 2013
•
Modified:
24 September 2026

Amprobe AT-2005 and AT-2005A are no longer manufactured.

In many industrial places, hospitals and large buildings electrical circuits run in metalic conduits.  It’s a great way to protect cables, but when it comes to tracing them behind walls it might be an impediment, as such conduits tend to depress the signal.  The only way to trace wires successfully over-and-over again is by using wire tracer with signal booster. 

READ MORE →
Amprobe AT-2005 Wire Tracer for Tracing Wires in Metalic Conduits
Flir
Inspection
Thermal Imagers

Flir i7 and Flir e30 Thermal Imaging Cameras Comparison

By:
Mark
•
Created:
8 May 2013
•
Modified:
24 September 2026

FLIR E30 and i7 are no longer manufactured.

Greetings Thermography enthusiasts! Today’s post will find us taking a look at the improvements the Flir E30 makes over the Flir I7. For starters, both cameras are lightweight and rugged feeling, instantly alleviating any worries about storing an expensive tool like these with your other gear. Fear not, these guys are built to last and to take a little rough use (within reason of course!).

READ MORE →
Flir i7 Thermal Imaging Camera
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