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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General Tools MMH800 Pin/Pinless Moisture Meter w/Temp and Humidity

Product ID: 4539569

Details

Battery Description
9V
Brand
General Tools
Item Weight
2 Pounds
Mounting Type
Surface Mount
Product Dimensions
3.63"W x

💧Pin & pinless moisture detection

📊Humidity range 25%-95%

🌡️Accurate temp ±3°C

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€ 257.16

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Details

Battery Description
9V
Brand
General Tools
Item Weight
2 Pounds

Description

💧 Stay ahead of mold with precision you can trust!

USER FRIENDLY DESIGN - Ergonomic grip with hold function and audible/visual alerts for quick diagnostics
SMART SAFETY ASSURANCE - Early mold detection to protect your home and family from hidden dampness
DUAL MOISTURE SENSING MODES - Pin and pinless sensors for precise readings on any surface
WIDE MATERIAL COMPATIBILITY - Effective on wood, drywall, concrete, and plaster for versatile home use
COMPREHENSIVE 4 IN 1 FUNCTIONALITY - Measures moisture, temperature, humidity, and detects leaks effortlessly

The General Tools MMH800 is a professional-grade 4-in-1 moisture meter combining pin and pinless technology to deliver accurate moisture, temperature, and humidity readings. Designed for both DIYers and pros, it features ergonomic grips, audible alerts, and a hold function, enabling early detection of water damage and mold risks across multiple building materials. Powered by a 9V battery, it ensures reliable performance and peace of mind in maintaining a safe, dry home environment.

Specifications

ASIN	B00563TQFG
Battery Description	9V
Best Sellers Rank	#54,054 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #20 in Moisture Meters
Brand	General Tools
Brand Name	General Tools
Customer Reviews	4.0 out of 5 stars 642 Reviews
Global Trade Identification Number	00681035014868
Included Components	General Tools MMH800 4-In-1 Combo Moisture Meter, Batteries
Item Dimensions W x H	3.63"W x 8.13"H
Item Type Name	Moisture Meter
Item Weight	2 Pounds
Manufacturer	General Tools
Model	MMH800
Mounting Type	Surface Mount
Operating Humidity	25% to 95%
Part Number	MMH800
Product Dimensions	3.63"W x 8.13"H
Smart Home Compatibility	Not Smart Home Compatible
Temperature Accuracy	±3°C
UPC	031113272343 031111204117 681035014868 031113186343
Unit Count	1.0 Count
Upper Temperature Range	130 Degrees Fahrenheit
Voltage	9 Volts
Warranty Description	1 year parts

Reviews

M**K

4.05.2024

S**R

12.01.2025

R**R

15.10.2025

T**R

23.03.2025

M**.

29.11.2024

A**R

26.08.2025

N**R

26.01.2023

D**A

8.04.2012

D**E

17.08.2021

A**R

2.07.2019

S**L

22.04.2024

S**A

22.07.2025

B**.

4.06.2023

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