1. Introdución
The PREXISO PMX-57A Wood Moisture Meter is a versatile digital instrument designed for accurately measuring moisture content in various materials. This pin-type meter provides precise readings for wood, walls, drywall, paper, and other building materials, helping to prevent issues like warping, cracking, and mold growth. It also features ambient temperature and humidity measurement capabilities.
2. Produto rematadoview
The PREXISO PMX-57A is equipped with high-precision pins for direct material penetration, ensuring accurate moisture detection. Its robust design and user-friendly interface make it suitable for professionals and DIY enthusiasts alike.
Características principais:
- Accurate Pin-Type Measurement: Two stainless steel pins provide direct and precise moisture readings.
- Medición multifuncional: Includes single-point, multi-point average, maximum, and minimum measurement modes. Also measures ambient temperature and humidity.
- 7-in-1 Calibration Scales: Pre-calibrated for 7 types of materials, including softwood, hardwood, and various building materials.
- Deseño fácil de usar: Features a color backlit LCD screen, data hold function, C/F temperature display, and automatic power-off.
- Agarre ergonómico: Sturdy, hand-friendly shape with rubber side grips for comfortable use.
Compoñentes:
Familiarize yourself with the main components of your PREXISO PMX-57A moisture meter:

Imaxe 2.1: Diagram illustrating the various components of the PREXISO PMX-57A Moisture Meter, including the probes, LCD display, control buttons, and probe cover.
- Sondas: Two sharp pins for penetrating materials to measure moisture.
- Capa da sonda: Protects the probes and includes a standard resistance test contact for calibration.
- Pantalla LCD: Backlit screen showing moisture content, temperature, humidity, and measurement modes.
- Botón H (Manter premido): Conxela a lectura actual na pantalla.
- Botón REC (Gravar): Used for recording data (specific functionality may vary, refer to advanced manual if available).
- AVG (Average) Button: Activates multi-point average measurement mode.
- M (Material) Button: Selects the material category for measurement.
- Botón °C/°F: Toggles between Celsius and Fahrenheit for temperature display.
- Botón de acendido / apagado: Acende ou apaga o dispositivo.
3. Configuración
3.1 Instalación da batería
The PREXISO PMX-57A requires 3 AAA batteries (included). To install or replace batteries:
- Localice o compartimento da batería na parte traseira do dispositivo.
- Usa un pequeno destornillador para abrir a tapa do compartimento da batería.
- Introduza 3 pilas AAA, asegurándose de manter a polaridade correcta (+/-).
- Peche ben a tapa do compartimento da batería.
3.2 Initial Calibration Check
Before first use and periodically thereafter, it is recommended to perform a calibration check using the standard resistance test contact integrated into the probe cover.

Imaxe 3.1: The PREXISO PMX-57A Moisture Meter undergoing a calibration check by inserting the probes into the standard test resistance contacts on the probe cover. The display shows an approximate 20.5% RH reading, indicating proper function.
- Ensure the meter is powered on.
- Carefully insert the meter's pins into the two metal contacts located on the inside of the probe cover.
- The display should show a reading of approximately 20.5% RH (Relative Humidity) or a similar reference value, indicating the meter is functioning correctly.
- If the reading is significantly different, contact customer support.
4. Instrucións de funcionamento
4.1 Encendido/apagado
- Preme o vermello Encendido/apagado botón para acender o medidor.
- O medidor apagarase automaticamente despois dun período de inactividade para aforrar batería.
- To manually turn off, press and hold the red Encendido/apagado botón.
4.2 Selecting Material Category
The PMX-57A features 7 pre-calibrated material categories to ensure accurate readings for different densities. Press the M button to cycle through the categories (M1 to M7).

Imaxe 4.1: The PREXISO PMX-57A Moisture Meter displaying the 7 material categories and their corresponding moisture measurement ranges for softwood, hardwood, wet building materials, and dry building materials.
| Código do material | Nome do material | Density Range | Rango de humidade |
|---|---|---|---|
| M1 | Softwood (e.g., beech, spruce, larch, birch, cherry, walnut) | 8.8-54.8 % | 9.0-57.0 % |
| M2 | Hardwood (e.g., oak, pine, maple, ash, Douglas fir, eucalyptus) | 6.8-47.9 % | 7.0-52.0 % |
| M3 | Cement mortar layer concrete | 0.9-22.1 % | 0.9-23.0 % |
| M4 | Anhydrous gypsum mortar layer | 0-11 % | 0.0-12.0 % |
| M5 | Morteiro de cemento | 0.7-8.6 % | 0.7-9.0 % |
| M6 | Lime mortar, gypsum | 0.6-9.9 % | 0.6-10.0 % |
| M7 | Ladrillo | 0.0-16.5 % | 0.0-17.0 % |
4.3 Tomar unha medida
- Select the appropriate material category (M1-M7) using the M botón.
- Carefully remove the probe cover.
- Firmly press the two pins into the surface of the material you wish to measure. Ensure both pins fully penetrate the surface for an accurate reading.
- Lea a porcentaxe de contido de humidadetage displayed on the LCD screen. The screen also shows ambient temperature and humidity.
- For consistent results, take multiple readings in different spots on the material and consider the average.

Imaxe 4.2: The PREXISO PMX-57A Moisture Meter in use, demonstrating measurements on various materials including softwood, hardwood, areas with potential mold water damage, drywall, cement mortar, and brick.
4.4 Modos de medición
The PMX-57A offers several measurement modes:

Imaxe 4.3: The PREXISO PMX-57A Moisture Meter's display showing different measurement modes: Power On, Single-point Measurement, Data Hold, Maximum Measurement, Minimum Measurement, and Multi-point Average Measurement.
- Single-point Measurement: The default mode, displaying the current moisture reading.
- Maximum (MAX) Measurement: Preme o H button to cycle through MAX/MIN/AVG. This mode displays the highest moisture reading recorded during a measurement session.
- Minimum (MIN) Measurement: Displays the lowest moisture reading recorded during a measurement session.
- Multi-point Average (AVG) Measurement: Preme o AVG button. Take multiple readings, and the meter will calculate and display the average moisture content.
4.5 Función de retención de datos
Para conxelar a lectura actual na pantalla, prema o botón H button. Press it again to release the hold and resume live readings.
4.6 Selección da unidade de temperatura
Preme o ° C / ° F button to switch between Celsius and Fahrenheit for ambient temperature display.
5. Mantemento
- Limpeza: After each use, wipe the probes and the meter body with a clean, dry cloth. Do not use abrasive cleaners or solvents.
- Protección da sonda: Always replace the probe cover when the meter is not in use to protect the pins from damage and prevent injury.
- Almacenamento: Garde o medidor nun lugar fresco e seco, lonxe da luz solar directa e de temperaturas extremas. Se o garda durante períodos prolongados, retire as pilas para evitar fugas.
- Substitución da batería: Substitúa as pilas cando apareza o indicador de batería baixa na pantalla para garantir lecturas precisas.
6 Solución de problemas
If you encounter issues with your PREXISO PMX-57A, refer to the following common problems and solutions:
| Problema | Causa posible | Solución |
|---|---|---|
| O medidor non se acende. | Baterías gastadas ou instaladas incorrectamente. | Comprobe a polaridade das pilas. Substitúaas por pilas AAA novas. |
| Lecturas inexactas ou inconsistentes. | Incorrect material category selected; probes not fully inserted; damaged probes; meter not calibrated. | Ensure correct material category is selected. Press probes firmly into the material. Check pins for damage. Perform a calibration check (Section 3.2). |
| A pantalla está escura ou parpadea. | Batería baixa. | Substitúe as pilas. |
| No reading when probes are inserted. | Probes not making good contact; material is extremely dry (below detection range). | Ensure probes are clean and fully inserted. Test on a known moist material to verify function. |
If the problem persists after attempting these solutions, please contact PREXISO customer support.
7. Especificacións
Detailed technical specifications for the PREXISO PMX-57A Moisture Meter:

Imaxe 7.1: The PREXISO PMX-57A Moisture Meter shown with its approximate dimensions: 14-3/4 inches in height, 6 inches in width, and 3-5/16 inches in depth.
| Especificación | Valor |
|---|---|
| Número de modelo | PMX-57A |
| Dimensións do produto | 3.3"W x 14.7"H (approx. 3.3 x 3.3 x 14.7 inches) |
| Peso do elemento | 0.26 quilogramos (aprox. 9.17 onzas) |
| Principio de medición | Electrical Resistance (Pin-Type) |
| Moisture Measurement Range | 0 % a 57 % (dependendo do material) |
| Categorías de materiais | 7 pre-calibrated types |
| Fonte de enerxía | 3 pilas AAA |
| Mostrar | Color Backlit LCD |
| Apagado automático | Yes, after inactivity |
| Unidade de temperatura | °C / °F seleccionable |
| Tipo de montaxe | Montaxe en superficie |
8. Garantía e soporte
PREXISO products are manufactured to high-quality standards. For warranty information, technical support, or service inquiries, please refer to the contact information provided with your product packaging or visit the official PREXISO websitio. Garde o comprobante de compra para reclamacións de garantía.





