b) Persons and product
• If the device is moved from a cold into a warm environment, condensation can
form inside the device. This can result in incorrect measurements. Leave the
device for a while to adjust to the new ambient conditions before commencing
operation.
• The user is responsible for the measured results from this device. We neither
guarantee nor assume responsibility for the correctness of the measured results.
Under no circumstances shall we assume responsibility for any damage caused
by application of the measured results.
c) (Rechargeable) battery
• Always check that the battery is inserted with the correct polarity.
• To prevent battery leakage, the battery should be removed from the device if it
is not used for a long period of time. Leaking or damaged batteries may cause
acid burns if they come into contact with your skin. Always use suitable protective
gloves when handling damaged batteries.
• Batteries must be kept out of the reach of children. Do not leave batteries lying
around, as there is a risk that children or pets may swallow them.
• Batteries must not be dismantled, short-circuited or thrown into flames. Never
recharge non-rechargeable batteries. Danger of explosion!
Product overview
Moisture measuring device
1
2
3
4
5
7
8
6
1 Moisture sensor
2 LC display
3
DOWN
button
4
SET
button
5
MEAS
button
6 On/off button
7
UP
button
8 Battery compartment (on rear)
LC display
11
12
13
14
15
17
16
9
10
18
9 Low battery indicator
10 “HOLD” data storage symbol
11 “DRY” status symbol
12 “RISK” status symbol
13 “WET” status symbol (moist status)
14 “MIN” symbol
15 Min. moisture level
16 Max. moisture level
17 “MAX” symbol
18 Current moisture level
Setup
a) Inserting and replacing the batteries
The moisture measuring device is operated via a 9 V block battery. The battery is included
separately. The battery must be inserted into the moisture measuring device.
To insert the battery, proceed as follows:
• With the aid of a screwdriver, remove the battery compartment cover from the rear of the
measuring device.
• Insert a new 9 V block battery into the battery compartment, paying attention to the correct
polarity (8). Ensure that the device's contacts are seated correctly.
• Replace the battery compartment cover and screw down tightly.
• Replace the battery if the low battery indicator (9) lights up on the LC display.
Ensure that the moisture measuring device is switched off before you replace the
battery.
• To replace the battery, proceed as described above. Remove the empty battery from the
battery compartment before inserting a new battery.
Operating instructions
MF-90 material moisture measuring device
Item no. 1611424
Intended use
The product is intended to be used for non-invasive, digital moisture measurement. It is ideal
for measuring the moisture level in concrete, wood and other construction materials. The
device can help in checking whether or not the surface is suitable for painting or coating. Large
surfaces can also be measured quickly and effectively with the signal function. The user can
concentrate on the object that is being measured without having to constantly read off the
measured values on the display. The device emits a signal when the moisture level exceeds
the limit value. The limit value can be adjusted. The device offers a measuring depth of around
20 - 40 mm and a wide measurement range and is equipped with a display of min./max. values
and a low battery indicator. The device is operated via a 9 V block battery. It also has an
automatic shut-off function.
For safety and approval purposes, you must not rebuild and/or modify this product. Using the
product for purposes other than those described above may damage the product. In addition,
improper use can cause hazards such as a short circuit or fire. Read the operating instructions
carefully and store them in a safe place. Only make this product available to third parties
together with its operating instructions.
This product complies with statutory, national and European regulations. All company and
product names are trademarks of their respective owners. All rights reserved.
Delivery content
• Moisture measuring device
• 1x 9 V block battery
• Operating instructions
Up-to-date operating instructions
Download the latest operating instructions at www.conrad.com/downloads or scan the QR code
shown. Follow the instructions on the website.
Explanation of symbols
The symbol with an exclamation mark in a triangle is used to highlight important
information in these operating instructions. Always read this information carefully.
The arrow symbol indicates special information and advice on how to use the
product.
Safety information
Read the operating instructions and safety information carefully. If you do
not follow the safety information and information on proper handling in these
operating instructions, we will assume no liability for any resulting personal
injury or damage to property. Such cases will invalidate the warranty/
guarantee.
a) General information
• The device is not a toy. Keep it out of the reach of children and pets.
• Do not leave packaging material lying around carelessly. It may become a
dangerous toy for children.
• Protect the product from extreme temperatures, direct sunlight, strong jolts, high
humidity, moisture, flammable gases, vapours and solvents.
• Do not place the product under any mechanical stress.
• If it is no longer possible to operate the product safely, take it out of operation and
protect it from any accidental use. Safe operation can no longer be guaranteed
if the product:
- is visibly damaged,
- is no longer working properly,
- has been stored for extended periods in poor ambient conditions or
- has been subjected to any serious transport-related stresses.
• Please handle the product carefully. Jolts, impacts or a fall even from a low height
may damage the product.
• Consult a technician if you are not sure how to use or connect the product, or if
you have concerns about safety.
• Maintenance, modifications and repairs must be carried out by a technician or a
specialist repair centre.
• If you have questions which remain unanswered by these operating instructions,
contact our technical support service or other technical personnel.
