4-in-1 pin/pad rh moisture meter mmh800
Contents
1. 56 in 15mm high digits Droplet Icon Ranges Low Medium High moisture gt 5 12 16 for wood and paper gt 1 5 17 20 for building material Auto Power Off After 3 minutes with 0 reading Low Battery Warning Level lt 7 25V Operating Temperature 32 to 122 F 0 to 50 C lt 80 relative humidity Dimensions 7 13 L x 2 17 W x 1 57 H in 181 x 55 x 40mm Weight 4 06 oz 115g without battery Current Consumption lt 20mADC Power Source 9V battery included MAINTENANCE TIPS The battery charge icon at the upper right of the display shows two bars m m when the voltage of the installed battery is between 7 25 and 9V When the charge drops to between 6 3 and 7 25V the icon will show only one bar on the right like this lt When the battery charge drops below 6 3V 1 the last bar of the icon will begin flashing 2 the beeper will sound repeatedly and 3 the unit will automatically power itself off in 15 seconds It is now time to replace the battery by following the Setup Instructions on p 7 When the tips of the meter s factory installed 5mm test pins show signs of wear replace them with a pair of 10mm or 15mm pins included in the case Remove the battery when storing the meter for an extended period of time Do not drop or disassemble the meter or immerse it in water WARRANTY INFORMATION General Tools amp Instruments General s MMH800 4 in 1 Pin Pad RH Moisture Meter is warranted to the ori2. GENERAL 4 IN 1 PIN PAD RH MOISTURE METER USER S MANUAL MMH800 Please read this manual carefully and thoroughly before using this product TABLE OF CONTENTS INTOOUCHON ss e cae eset eee eee se 746 3 4 Key Features sc cccsccnnetswe ieee teeis Sa a 5 What s in the Case viii caine Pane eae haawarns 5 Product Overview s 6 62606 e ence eee need Sele 6 7 Setup Instructions 000ee ee eee 7 Install Battery 002 7 Operating Instructions 2200000es 8 10 Measuring Moisture Level 0000005 8 Accounting For Temperature and Humidity 9 Checking Calibration 00202ee eee 10 Specifications ariran ees 10 Maintenance TipS 20000e eee eens 11 Warranty Information 0000 cece eens 11 Return for Repair Policy 22000eeeee 12 INTRODUCTION Thank you for purchasing General Tools amp Instruments MMH800 4 in 1 Pin Pad RH Moisture Meter Please read this user s manual carefully and thoroughly before using the meter The MMH800 is designed for use in woodworking water damage restoration building construction and home renovation Examples include e Checking for moisture on or below the surface of carpets e Measuring the surface moisture and or moisture content of wood drywall or concrete before painting wallpapering sealing or treating e Locating water leaks in roofs floors and walls e Selecting dry lumber Because it can measur
3. NY 10013 212 431 6100 Remember to include a copy of your proof of purchase your return address and your phone number and or e mail address Specialty Tools amp Instruments GENERAL TOOLS amp INSTRUMENTS 80 White Street New York NY 10013 3567 PHONE 212 431 6100 FAX 212 431 6499 TOLL FREE 800 697 8665 e mail sales generaltools com www generaltools com MMH800 User s Manual Specifications subject to change without notice 2013 GENERAL TOOLS amp INSTRUMENTS NOTICE WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS MAN MMH800 3 15 2013
4. button briefly This freezes the display and makes the O lock icon appear at the right of the reading This feature makes it possible to make a measurement in a dark place hold the reading and display it later in a better lighted area To release the lock press the button briefly again This makes the O icon disappear The meter s beeper is enabled by default To disable the beeper press the button and hold it for at least three seconds This makes the en icon at the lower left of the display disappear To re enable the beeper press and hold the button again for at least three seconds Each time the meter is powered on the unit reverts to the default state beeper enabled 8 Some measurement tips 1 To locate the source of a leak behind wood plaster drywall or a ceiling make measurements at different locations The leak is where the meter displays the highest reading 2 Never use force to drive the test pins into a hard surface 3 When measuring the moisture level of soil surface readings will be lower than readings with the test pins deep in the soil ACCOUNTING FOR TEMPERATURE AND HUMIDITY Measurements of wood moisture level are skewed by two variables ambient humidity and the density of the wood species The best way to compensate for the effect of these variables is to develop your own moisture level curves based on your experience working with different species of wood on a day to day basis in your neighbo
5. e ambient temperature and humidity in addition to moisture level the MMH800 is particularly suitable for water damage restoration projects The meter has two LCDs one displays moisture level and the other a split screen display monitors temperature and humidity A dedicated front panel button selects the default temperature unit degrees Fahrenheit or degrees Celsius The 4 in 1 part of the meter s name refers to its ability to measure 1 temperature 2 relative humidity 3 moisture level using a pin sensor and 4 moisture level using a pad sensor The meter has both kinds of sensors with a pair of pins on top and a split metal pad on the back Both sensors base their measurements on the relationship between the moisture content of a material and its electrical conductivity The wetter a material the higher its conductivity In both cases the sensors serve as the electrodes of a conductivity meter optimized for measuring moisture content Which sensor should you use It depends on the application The pad sensor is the only choice for measuring surface moisture of materials like finished wood paint or wallpaper that cannot be marred by pinholes If measurement accuracy is important the pin sensor is the better option because pins can detect moisture below the surface that the pad sensor cannot However for hard materials like wood or concrete the meter s readings mostly represent surface moisture content because 1 Mois
6. efault C If you prefer to work in F you must press the button to begin each measurement session CHECKING CALIBRATION As mentioned earlier the meter is factory calibrated for measuring the moisture level of wood and building materials on different scales To check the calibrations remove the protective cap from the top of the meter taking care not to stab yourself with the two sharp pins beneath it Then flip the cap over and place the two holes in its top over the meter s two test pins The upper display should read 17 5 3 with the meter in wood measurement mode and 16 4 3 in building materials measurement mode You can toggle the button to check both calibrations without removing the protective cap If either calibration check produces a readout outside the stated range for that mode and the meter is still under warranty call General s Customer Service Department at 212 431 6100 to arrange to return the meter for service or replacement SPECIFICATIONS Moisture Level Measurement Range 5 to 50 for wood paper 1 5 to 33 for building materials Measurement Accuracy 3 Measurement Resolution 0 1 Temperature Measurement Range 32 to 140 F 0 to 60 C Temperature Measurement Accuracy 2 F 2 C Humidity Measurement Range 25 to 95 Humidity Measurement Accuracy 5 from 32 to 104 F 0 to 40 C Display Type Size 99 9 count LCD with 0
7. ess the button and hold it for at least three seconds To power off the meter follow the same instruction MEASURING MOISTURE LEVEL To measure the moisture level of wood or a building material first make sure that its icon appears on the left side of the display If it does not press the A button briefly to toggle between wood and building materials Next decide which sensor to use the meter s pins or pad after considering their pros and cons presented in the introduction Either 1 Gently press or push the pins at the top of the meter on or into the material or 2 Press the split pad sensor on the back against a flat area of the material making sure that both sides of the pad touch the surface being measured The MMH800 provides three indications of a material s measured moisture content 1 A percentage reading on the upper display 2 One two or three droplet icons on the left side of the upper display to indicate whether the reading is low medium or high for the material The moisture level range for each category is different for wood paper and building materials see the Specifications section for the exact percentages 3 If enabled the factory default the meter s repeating beeper will sound at one of three rates slow medium or fast corresponding to the measured moisture level low medium or high The audible changes make it very easy to pinpoint areas of peak wetness To hold a measurement press the
8. ginal purchaser to be free from defects in material and workmanship for a period of one year Subject to certain restrictions General will repair or replace this instrument if after examination the company determines it to be defective in material or workmanship This warranty does not apply to damages that General determines to be from an attempted repair by non authorized personnel or misuse alterations normal wear and tear or accidental damage The defective unit must be returned to General Tools amp Instruments or to a General authorized service center freight prepaid and insured Acceptance of the exclusive repair and replacement remedies described herein is a condition of the contract for purchase of this product In no event shall General be liable for any incidental special consequential or punitive damages or for any cost attorneys fees expenses or losses alleged to be a consequence of any damage due to failure of or defect in any product including but not limited to any claims for loss of profits RETURN FOR REPAIR POLICY Every effort has been made to provide you with a reliable product of superior quality However in the event your instrument requires repair please contact our Customer Service to obtain an RGA Return Goods Authorization number before forwarding the unit via prepaid freight to the attention of our Service Center at this address General Tools amp Instruments 80 White Street New York
9. ighted area The meter is also equipped with a repeating beeper that beeps faster with rising moisture level which makes it easy to detect areas of peak wetness The beeper can be disabled without affecting measurements The meter also has the following three features e t automatically powers off after three minutes of inactivity to extend battery life e An icon on the upper display indicates when the meter s 9V battery is low on charge e The protective pin cover can be used to check the meter s Calibration KEY FEATURES e Pin intrusive measurement of moisture content and pad non intrusive measurement of surface moisture sensors e Separate 3 digit displays of moisture level and temperature humidity e Selectable wood or building materials measurement mode e F C unit selection e Wide measurement range and high accuracy e Audible and visual indications of high medium and low moisture levels e Holds moisture level readings for convenient viewing later e Pin cover doubles as calibration checker e Auto power off function e Battery charge indicator e Powered by single 9V battery WHAT S IN THE CASE The MMH800 comes in a custom hard carrying case along with a 9V battery two pairs of extra test pins 10mm and 15mm long and this user s manual PRODUCT OVERVIEW The figure below shows all of the controls and indicators on the front of the MMH800 as well as the locations of the sensor and battery compartmen
10. rhood For example the humidity level affects the dryness of interior wood considered acceptable for finishing In the steamy Deep South where 60 relative humidity is the norm fine carpenters have learned how to work with wood with 11 moisture content But in bone dry Nevada Utah and Arizona where 30 humidity is common the same piece of wood would have to have less than 6 moisture to be considered ready for finishing Moisture levels are just as important to know when joining wood but for a different reason If two work pieces have different moisture levels when they are joined when they dry out they will contract by different amounts at different rates In the extreme the result could be a warped board or a weakened joint Temperature also affects moisture levels to the extent that it affects relative humidity levels The hotter the air the more water it can hold A relative humidity level of 50 means that the ambient air is holding only half the moisture is it capable of holding The MMH800 s split screen lower display can help you develop your own custom moisture level curves by providing real time temperature and humidity readings Both measurements are made and displayed continuously whenever the meter is powered on The meter s default temperature unit is degrees Celsius C To change the measurement unit to degrees Fahrenheit F press the Cer button Each time the meter is powered on the unit reverts to the d
11. t on its back ey i Slt AYALIVE 19979 7749 931 dbX LIOA 6 INTYAIY ISN FRONT BACK A Calibration holes B Protective cover C Replaceable test pins D Ta low medium highmoisture level icon high moisture shown NN High E Wood icon F amp Building materials icon G en Beeper enabled icon H Dual function button Power on off press and hold for gt 3 seconds Backlight on off press briefly I Temperature and humidity split screen display J Battery compartment cover K Dual function button Beeper on off press and hold for gt 3 seconds Moisture reading hold release press briefly L button Selects wood or building materials M C button Toggles between temperature units N Split metal pad sensor 0 O icon Indicates display is locked or frozen P cam icon Battery charge indicator see p 11 Q Temperature humidity sensor vent SETUP INSTRUCTIONS INSTALL BATTERY To open the battery compartment turn the meter over and use your thumb to slide the battery compartment cover down and away from the unit Plug a fresh 9V battery into the wired socket inside the compartment The terminals of the battery and the socket mate in only one way with the smaller male terminal plugging into the larger female terminal Close the battery compartment by replacing its cover and snapping it shut OPERATING INSTRUCTIONS To power on the meter pr
12. ture close to the surface has a greater effect on a reading than moisture deep below it and 2 The factory installed pins of the MMH800 are only 0 2 in 5mm long and cannot be driven deep into a hard material For softer materials like soil paper or powders readings are more likely to reflect the average moisture level of the material between its surface and the penetration depth of the pins usually far less than 0 2 in To improve the meter s overall measurement accuracy the MMH800 ships with a 4 pack of pins two are 0 4 in 10mm long and the other two are 0 6 in 15mm long Moisture level readings are displayed as percentages on the upper LCD of the MMH800 which is factory calibrated for use with wood paper and building materials concrete bricks wallboard etc Because moisture affects the conductivity of wood paper and building materials differently the meter measures their moisture content using different scales e For wood and paper the moisture level measurement range is 5 to 50 e For building materials the range is 1 5 to 33 A front panel button allows you to switch between the two materials Display icons indicate which material is being tested as well as whether the current reading is considered low medium or high for the material Any reading can be held by pushing another front panel button this feature makes it possible to make a measurement in a dark place hold it and display it later in a better l
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