User Guide Dual Moisture Meter Pin / Pinless Moisture Meter Model MO260
Introduction Congratulations on your purchase of the Extech MO260 Moisture Meter. The MO260 detects moisture in wood and other materials such as particle board, carpeting, and ceiling/bathroom tiles using the non-invasive method (pinless); the MO260 also measures moisture in sheet rock and other building materials using the pin method. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.
Description Meter Description 1. Electrode pins protective cap 2. LCD display 3. Tri-color Bargraph 4. HOLD / POWER key 5. Protective cap attachment 6. Protective cap holders 7. MODE button Notes: • Battery/Spare Pin compartment located on the rear of the instrument • Electrode pins located beneath the protective cap • Calibration points located at the top of protective cap LCD Display Description 1. Measurement reading 2. Battery status 3. Audible alert icon 4.
Operation Electrode Pins CAUTION: The electrode measurement pins are extremely sharp. Use care when handling this instrument. Cover the pins with the protective cap when the instrument is not in use. The electrode pins are replaceable / removeable and must be inserted before the meter can be used. To insert or replace the pins refer to the illustration and instructions below. Replacement pins are stored in the battery compartment at the rear of the meter.
Basic Operation for Pinless Measurments 1. Ensure that the protective cap is attached to the meter covering the pins. 2. Press the 3. Press the MODE key to select the Relative (REL) mode of operation. 4. The pinless moisture detector is located at the rear of the instrument, just behind the display. Place the meter so that the sensor is touching the surface of the material under test. 5.
LCD Backlight ON/OFF With the meter switched ON, pressing and holding both front panel buttons (MODE and HOLD) switches the LCD backlight ON and OFF. Data Hold feature The Data Hold function freezes the reading in the display. Press the HOLD key momentarily to activate the Data Hold function. The reading will freeze and the ‘key’ display icon will appear. Press the HOLD key again to exit the Data Hold function (the ‘key’ display icon will switch off).
Battery Replacement If the instrument does not switch ON or displays the low battery symbol, replace the battery as follows: 1. 2. 3. 4.
User's Guide Precision Hygro-Thermometer Model RH490
Introduction Congratulations on your purchase of the Extech RH490 Precision HygroThermometer. This device measures Humidity, Air Temperature, Dew Point temperature, Wet Bulb temperature and Grains of Water Vapor Per Pound of Air. Advanced features include Data Hold, Auto Power Off, and MAX/MIN reading. This meter is shipped fully tested and calibrated and with proper use will provide years of reliable service. Meter Description 1. 2.
Operation Power Press the power button “ “ to turn power on or off. %RH 1. To select %RH measurement, press the “%RH/GPP/g/Kg” button. 2. Hold the probe in the area to be tested. 3. Allow adequate time for readings to stabilize. 4. The Relative Humidity measurement appears in the top display. 5. Pressing the “°F/°C/WBT/Dew Point” button toggles the lower display between Temperature (°F), Temperature (°C), Dew Point (°C), Dew Point (°F), Wet Bulb (°C) and Wet Bulb (°F).
Dew Point 1. To select the Dew Point measurement, press the “°F/°C/WBT/Dew Point” button until DEWPOINT (°F or °C) appears in the lower right. 2. Dew Point temperature is now displayed. Wet Bulb 1. To select the Wet Bulb measurement, press the “°F/°C/WBT/Dew Point” button until WET BULB (°F or °C) appears in the lower right. 2. Wet Bulb temperature is now displayed. Temperature 1. 2.
Minimum (MIN) Maximum (MAX) Function The MIN/MAX mode allows the user to view only the lowest (MIN) or highest (MAX) readings. 1. Press the ”H MAX MIN” button twice and “MIN” appears on the display. The LCD is now displaying the minimum value recorded in both the top and bottom display. The display will not change until a lower reading is registered. 2. Press the ”H MAX MIN” button again and “MAX” appears on the display.
Specifications Function Range and Resolution Accuracy Humidity 0.0 to 10.0%RH ±3%RH Temperature Wet Bulb 10.0 to 90.0%RH ±2%RH 90.0 to 100.0%RH ±3%RH -22.0 to – 3.9oF -30.0 to -19.9oC o ±2.7 F o ±1.5 C -20.0 to 70.0oC -4.0 to 158.0oF ±1 C ±1.8oF 70.1 to 100.0oC 158.1 to 199.0oF o ±1.5 C ±2.
