MO297 by Extech - Pinless Moisture Psychrometer

Area Monitoring Datalogging
Moisture Meter Manufacturer: Extech
MO297 by Extech - Pinless Moisture Psychrometer
MO297 by Extech - Pinless Moisture Psychrometer
MO297 by Extech - Pinless Moisture Psychrometer

Note: This unit is calibrated every 2 years. NIST calibration is valid for 1 year. Contact RAECO Rents to confirm availability if required.

The Extech MO297 is an all-in-one moisture psychrometer for building inspections, water damage restoration, mold prevention, and HVAC diagnostics. Its pinless sensor detects moisture up to 0.75" (19 mm) below the surface without damage, while the pin probe measures 6–99% moisture in wood and 13–99% in building materials. Additional measurements include relative humidity (0–100%, ±2.5–3%), air temperature (-20 to 170°F), and infrared temperature (-4 to 392°F) with an 8:1 distance-to-spot ratio. The dual display simultaneously shows moisture alongside dew point, vapor pressure, or grains per pound. Features 20-reading internal memory, programmable high/low alarms, and condensation risk alerts.

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$125.00
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What is the Extech MO297 used for?
It's a pinless moisture meter combined with a psychrometer for building inspections, water damage assessment, flooring installation, and HVAC work. It scans material moisture non-invasively and simultaneously measures ambient RH, air temperature, and dew point — giving you both material condition and drying environment data in one instrument.
What does pinless measurement mean, and what are its limits?
Pinless measurement uses RF technology to scan moisture through material surfaces without leaving holes. It gives fast screening results but reads to a defined depth — it won't detect moisture deep inside structural members. Use pinless for quick scanning, then follow up with pin measurements where you need depth or precision.
What parameters does the MO297 measure?
Material moisture (pinless), relative humidity, air temperature, dew point, and wet bulb temperature. This combination supports both water damage documentation and drying progress tracking.
MO297 vs. the Protimeter Technician's Kit — which should I choose?
The MO297 is a single-instrument solution for inspectors who need basic pinless moisture scanning plus ambient psychrometrics. The Protimeter Kit adds pin-mode capability, deeper psychrometric calculations (grains per pound, enthalpy), and higher data storage — better for full restoration documentation workflows.
Why do moisture readings vary across the same floor or wall?
Moisture migrates unevenly along framing, beneath flooring, and through insulation. Scan in a grid pattern and confirm high-reading areas with additional measurements to map the moisture boundary accurately.
What's a common mistake in moisture assessment?
Taking a single-point reading and concluding an area is dry. Document a grid of measurement locations so you can demonstrate drying progress over time with repeatable, comparable data.
What does it cost to rent the Extech MO297?
$55/day and $125/week. For restoration or inspection projects requiring return visits to track drying progress, the weekly rate is more economical than day rates. Most drying verification programs require multiple visits over 3–7 days minimum.

Exposure Hazards This Equipment Detects

Humidity (% RH)

CAS: N/A
Learn More
Updated on March 09, 2026
PEL TWA
N/A
REL TWA
N/A
TLV TWA
N/A

Temperature (°C / °F)

CAS: N/A
Learn More
Updated on March 09, 2026
PEL TWA
N/A
REL TWA
N/A
TLV TWA
N/A

Features & Capabilities

Calibration Certificate Available: ✓ Yes
Datalogging: ✓ Yes
Monitoring Scope: Area Monitoring

Equipment Specifications

Derived Measurements: Dew Point, Vapor Pressure, Grains Per Pound (Mixing Ratio)
Pin Moisture Range: 6-99% (wood), ±5%; 13-99% (building materials), ±5%
Pinless Moisture Range: 0-99.9% (relative scale only)
Pinless Depth: Up to 0.75 in. (19 mm)
Relative Humidity Range: 0-100%, ±2.5% to ±3%
Temperature Range: -20 to 170°F (-29 to 77°C), ±3.6°F
Infrared Surface Temp Range: -4 to 392°F (-20 to 200°C), 8:1 distance-to-spot ratio, 0.95 fixed emissivity
Alarm Features: Programmable high/low moisture and humidity alarms
Indicator Type: Dual numeric display (simultaneous moisture + dew point/vapor pressure/grains per pound)
Probe/Accessory Options: Remote pin-type probe (MO290-P) with 3-foot cable for contact moisture readings
Data Storage Capacity: 20 readings (internal memory)
Battery Life: 24-32 hours (9V alkaline battery)

Kit Contents

Extech MO297 Moisture Meter, Pinned Moisture Probe, Spare 9V Battery and Phillips-Head Screwdriver, Moisture Pin Calcheck, Quick Start Guide / Manual (May be on Flash Drive), Calibration Certificate (Emailed)

Manufacturer Resources

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