EXTECH Manuals & User Guides

User manuals, setup guides, troubleshooting help, and repair information for EXTECH products.

Tip: include the full model number printed on your EXTECH label for the best match.

EXTECH manuals

Latest posts, featured manuals, and retailer-linked manuals for this brand tag.

EXTECH 407026 Heavy Duty Meter User Guide

EXTECH 407026 Heavy Duty Meter User Guide

March 4, 2023
407026 Heavy Duty Meter User Guide Introduction Congratulations on your purchase of the Extech Heavy Duty Light Meter. This light meter offers selectable lighting types, data record/recall, relative display mode, and PC interface. This professional meter, with proper care, will…
Brand: EXTECH
EXTECH LT40 White LED Light Meter User Manual

EXTECH LT40 White LED Light Meter User Manual

March 3, 2023
EXTECH LT40 White LED Light Meter Introduction Congratulations on your purchase of the Extech LT40 LED Light Meter that measures light intensity from white LED light sources. The LT40 can also measure light from fluorescent, metal halide, high-pressure sodium, and…
Brand: EXTECH
EXTECH PH90 Waterproof pH-Temperature Meter User Manual

EXTECH PH90 Waterproof pH-Temperature Meter User Manual

January 29, 2023
Waterproof pH/Temperature Meter  Model PH90  USER MANUAL Introduction Thank you for selecting the Extech Model PH90 waterproof pH/Temperature meter. This instrument is equipped with a flat surface pH electrode (model pH95) for reliable test results.  This device is shipped fully tested…
Brand: EXTECH
EXTECH ET23B Low Voltage Tester User Manual

EXTECH ET23B Low Voltage Tester User Manual

January 23, 2023
ET23B Low Voltage Tester User Manual OPERATION To check a circuit for voltage, connect the test leads to the electrical contacts or conductor to be tested. If voltage is present, the indicator will light. Clean the surface of the tester…
Brand: EXTECH
EXTECH PH220 Waterproof Palm pH Meter User Manual

EXTECH PH220 Waterproof Palm pH Meter User Manual

January 14, 2023
EXTECH PH220 Waterproof Palm pH Meter Introduction Congratulations on your purchase of the Extech PH220 waterproof pH/mV meter. This microprocessor-based device with tactile push-buttons is battery operated and ideal for field use. The PH220 simultaneously displays pH and temperature. The…
Brand: EXTECH
EXTECH ET26B 4 Way Circuit Tester User Manual

EXTECH ET26B 4 Way Circuit Tester User Manual

January 13, 2023
EXTECH ET26B 4 Way Circuit Tester OPERATION To check a circuit for voltage, insert the test leads into outlet or carefully touch test leads to the electrical contacts or conductor to be tested. If voltage is present, the neon indicator…
Brand: EXTECH
EXTECH 42280A Temperature and Humidity Datalogger User Guide

EXTECH 42280A Temperature and Humidity Datalogger User Guide

December 17, 2022
EXTECH 42280A Temperature and Humidity Datalogger Introduction The 42280A is a portable, battery operated instrument that moni-tors, displays, and logs Temperature and Relative Humidity (RH). The 42280A can monitor environmental conditions in a variety of residential and commercial storage and…
Brand: EXTECH
EXTECH MO25 Moisture Meter User Guide

EXTECH MO25 Moisture Meter User Guide

December 8, 2022
MO25 MOISTURE METER USER GUIDE Introduction The MO25 measures moisture (%WME) in wood, brick, concrete, paper, & fabric and traces leakage inside walls, ceilings, and floors. Description Contact pins (replaceable) Power/Hold button LED lamps Pocket clip Battery compartment Operation CAUTION:…
Brand: EXTECH
Extech Electromagnetic Field Meter Model 480823 User Manual

Extech Electromagnetic Field Meter Model 480823 User Manual

User Manual • September 24, 2025
User manual for the Extech Electromagnetic Field Meter, Model 480823. This document details the meter's specifications, operation, battery replacement, EMF exposure information, warranty, and calibration services. It measures EMF in Gauss and Tesla units with a frequency bandwidth of 30 to 300Hz.
Brand: Extech
Extech MO100 Moisture Detector User's Guide

Extech MO100 Moisture Detector User's Guide

User's Guide • September 17, 2025
User's guide for the Extech MO100 Moisture Detector, detailing its features, operation, specifications, and safety precautions. Learn how to calibrate, take readings, and understand moisture content conversions.
Brand: Extech