Does it have masonry setting?

The MMH800 is designed for use in woodworking, water damage restoration, building construction and home renovation. Examples include: • Checking for moisture on or below the surface of carpets • Measuring the surface moisture and/or moisture content of wood, drywall or concrete before painting, wallpapering, sealing or treating.

What's the probe length? Are they insulated or replaceable?

As far as i can tell the probes are about 3/8 long. The are metal, and have a plastic cover to protect them and you when not in use. The cap can also be flipped over once taken off, to help check device itself, for calibration. They are replaceable. They actually come with an extra set of pins (probes). Hope this helps.

Will this work for firewood?

you are going to get a reading to the depth of the prongs about a third of an inch.

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4-In-1 Pin/Pinless Combo Moisture Meter #mmh800 - Pin/Pinless Combo Mold Detector For Home - Dual Lcd Display & Audible Alarm

Product ID: 266500528

Details

Battery description
9 volt battery
Brand
General Tools
Item weight
1.95 Pounds
Mounting type
Freestanding
Product dimensions
20.7W x 30.5H

📊Dual LCD displays moisture & temp

📡Pin & pinless sensor combo

🔔Audible alarm for moisture alerts

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Description

🔍 Stay ahead of mold with precision you can trust!

DUAL LCD DISPLAY - Simultaneously monitor moisture percentage, ambient temperature, and humidity for comprehensive environmental insight.
REAL TIME ALERTS - Audible and visual alarms instantly notify you of high moisture levels, so you never miss a critical warning.
TRUSTED PROFESSIONAL GRADE - Backed by General Tools’ legacy, this meter combines precision engineering with user-friendly design for smarter home care.
MULTI SURFACE COMPATIBILITY - Effortlessly test wood, plaster, floors, and even plants—ideal for home pros and DIYers aiming to protect their space.
PRECISION MOISTURE DETECTION - Pin and pinless sensors deliver versatile, accurate readings across surfaces for confident mold prevention.

The General Tools 4-In-1 Pin/Pinless Combo Moisture Meter MMH800 offers professional-grade moisture detection with dual LCD displays, pin and pinless sensors, and audible alarms. Designed for versatile use on wood, plaster, floors, and more, it provides accurate moisture, temperature, and humidity readings to help prevent mold growth and water damage in your home.

Specifications

ASIN	B00563TQFG
ASIN	B00563TQFG
Battery Description	9 volt battery
Best Sellers Rank	#12,292 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #10 in Moisture Meters
Brand Name	General Tools
Country Of Origin	China
Country of origin	China
Customer Reviews	4.0 4.0 out of 5 stars (630)
Customer reviews	4.0 4.0 out of 5 stars (630)
Date First Available	31 August 2012
Global Trade Identification Number	00681035014868
Included Components	General Tools MMH800 4-In-1 Combo Moisture Meter, Batteries
Is Discontinued By Manufacturer	No
Item Dimensions W x H	20.7W x 30.5H centimeters
Item Type Name	Moisture Meter
Item Weight	1.95 Pounds
Item model number	MMH800
Manufacturer	General Tools
Manufacturer	General Tools
Model	MMH800
Mounting Type	Freestanding
Operating Humidity	25% to 95%
Part Number	MMH800
Product Dimensions	9.22 x 20.65 x 30.48 cm; 884.51 g
Temperature Accuracy	±3°C
UPC	031113272343 031111204117 681035014868 031113186343
Unit Count	1 Count
Upper Temperature Range	130 Degrees Fahrenheit
Voltage	9 Volts

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