RH250W - Measuring equipment Extech - Free user manual and instructions
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| Product Type | Moisture Meter |
| Model | RH250W |
| Brand | Extech |
| Measurement Range | 0% to 99.9% moisture content |
| Resolution | 0.1% |
| Accuracy | ±1% (typical) |
| Measurement Modes | Wood, building materials, and comparative mode |
| Display | Backlit LCD with bargraph |
| Dimensions | 180 x 50 x 31 mm (7.1 x 2.0 x 1.2 in) |
| Weight | 150 g (5.3 oz) including battery |
| Power Supply | One 9V battery (NEDA 1604, IEC 6F22) |
| Battery Life | Approximately 100 hours continuous use |
| Probe Type | Built-in pins (2 pins, 5 mm length) |
| Operating Temperature | 0°C to 50°C (32°F to 122°F) |
| Storage Temperature | -10°C to 60°C (14°F to 140°F) |
| Standards Compliance | CE, RoHS |
| Included Accessories | 9V battery, user manual |
| Maintenance | Keep pins clean; replace battery when low; store in dry place |
| Safety | Not for live electrical circuits; avoid contact with water on pins |
| Spare Parts / Repairability | Contact Extech for service; battery and probes are user-replaceable |
| Warranty | 1 year limited warranty |
Frequently Asked Questions - RH250W Extech
How do I turn on the Extech RH250W?
Press the Power button located on the front panel. The device will power on and display the current moisture reading.
What materials can I measure with this meter?
The RH250W is designed for wood and building materials such as drywall, concrete, and brick. Use the appropriate mode for the material being tested.
How do I calibrate the moisture meter?
The meter is factory-calibrated. For verification, use the included calibration check or a known moisture standard. If needed, contact Extech for recalibration.
Why does the display show '0' or 'OL'?
A reading of '0' may indicate the material is dry or the pins are not making good contact. 'OL' means over range; the moisture content is above the measurement limit (99.9%). Ensure pins are fully inserted.
How do I replace the battery?
Open the battery compartment on the back, remove the old 9V battery, insert a new one observing polarity, and close the compartment securely.
Can I use the meter on live electrical wires?
No. The RH250W is not rated for live circuits. Using it on energized wires may damage the meter and pose a safety hazard.
How deep do the pins penetrate?
The built-in pins are 5 mm (0.2 in) long. For deeper measurements, you can use optional external probes (not included).
What does the bargraph indicate?
The bargraph provides a quick visual reference of moisture level, with segments lighting up as moisture increases. Use it together with the digital reading.
How do I clean the device?
Wipe the housing with a soft, dry cloth. Clean the pins with a damp cloth and dry thoroughly. Do not use solvents or immerse in water.
Where can I find the user manual?
The manual is available for free download in PDF format from the Extech website or on the retailer's product page. It contains detailed instructions and specifications.
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USER MANUAL RH250W Extech
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Product information
Brand : Extech
Model : RH250W
Category : Measuring equipment