MR77 - Measuring equipment FLIR - Free user manual and instructions
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| Product Type | Pinless Moisture Meter |
| Brand | FLIR |
| Model | MR77 |
| Display | Backlit LCD with color-coded alerts |
| Measuring Range | 0% to 100% relative moisture content |
| Depth of Measurement | Up to 20 mm (0.79 in) under surface |
| Resolution | 0.1% relative moisture |
| Accuracy | ±1.5% (typical) at reference conditions |
| Power Supply | 2 x AA batteries (1.5V, alkaline recommended) |
| Battery Life | Approximately 60 hours of continuous use |
| Dimensions | 180 mm x 70 mm x 35 mm (7.1 x 2.8 x 1.4 in) |
| Weight | 200 g (7.1 oz) including batteries |
| Operating Temperature | 0°C to 50°C (32°F to 122°F) |
| Storage Temperature | -20°C to 60°C (-4°F to 140°F) |
| Humidity Range | 0% to 90% RH (non-condensing) |
| Key Functions | Pinless moisture detection, temperature compensation, data hold, auto power-off |
| Indication | Visual (LCD) and audible (buzzer) alerts |
| Calibration | Factory calibrated; user recalibration not required |
| Maintenance | Clean with dry soft cloth; avoid solvents; remove batteries if not in use |
| Safety | Designed for indoor use; do not immerse in liquids; keep away from heat sources |
| Accessories Included | User manual, batteries (2x AA), carrying case |
| Spare Parts / Repairability | Battery compartment; no user-serviceable parts inside; contact FLIR for service |
| Certifications | CE, FCC, RoHS |
Frequently Asked Questions - MR77 FLIR
How do I turn on the FLIR MR77?
Press and hold the power button for about 2 seconds until the display lights up. The meter will start measuring immediately.
What is the measuring depth of the MR77?
The FLIR MR77 measures moisture up to 20 mm (0.79 in) beneath the surface, making it suitable for non-invasive checks on drywall, wood, and concrete.
Can I use the MR77 on concrete floors?
Yes, the MR77 can measure moisture in concrete, but note that readings are relative and should be compared to a known dry reference for accurate assessment.
How do I change the batteries in the MR77?
Slide the battery cover (located on the back) downward, remove the old batteries, and insert two new AA alkaline batteries in the correct polarity direction.
What do the color-coded indicators mean?
Green indicates low moisture (safe), yellow indicates moderate moisture (caution), and red indicates high moisture (wet/damage risk). An audible tone accompanies high readings.
Why does my MR77 show inconsistent readings?
Ensure the sensor plate is flat against the material and free of dirt or moisture. Avoid measuring over metal objects or in extreme temperatures. Allow the device to stabilize for a few seconds.
How do I clean and maintain the MR77?
Wipe the casing and sensor with a soft, dry cloth. Do not use water, solvents, or abrasives. Remove batteries if storing for more than 30 days.
Is the MR77 suitable for outdoor use?
The MR77 is designed for indoor use only. Do not expose to rain or condensation. Operating range is 0°C to 50°C (32°F to 122°F).
Can the MR77 detect moisture behind tiles?
Yes, the pinless sensor can detect moisture through non-metallic surfaces up to 20 mm thick, including ceramic tiles and grout.
What should I do if the MR77 does not turn on?
Check the batteries for charge and correct polarity. If still not working, remove batteries, wait 30 seconds, and reinsert. If problem persists, contact FLIR support.
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USER MANUAL MR77 FLIR
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Product information
Brand : FLIR
Model : MR77
Category : Measuring equipment