1. Introdución
The Extech Instruments HW30 HeatWatch is a multi-function stopwatch designed to provide essential environmental data alongside precise timing capabilities. This device displays digital up/down timer functions, current temperature, humidity, and calculates the heat index, which indicates how hot it feels when humidity is combined with the actual temperature. It is an ideal tool for monitoring conditions in various environments, particularly those with hot weather. Additional features include a 12/24-hour clock, a standard stopwatch, 30 lap/split memory, and a programmable alarm.
2. Características clave
- Multi-function stopwatch with digital display.
- Integrated up/down timer.
- Real-time temperature display.
- Real-time humidity display.
- Heat Index calculation for perceived temperature.
- 12/24-hour clock display.
- Stopwatch function with 30 lap/split memory.
- Función de alarma programable.
3. Contido do paquete
Verifique que todos os elementos estean presentes e en bo estado ao abrir o paquete:
- HW30 HeatWatch Humidity and Temperature Stopwatch
- Acollador
- 1 x Lithium Metal Battery (installed or separate)
- Instrucións de funcionamento (este manual)
4. Produto rematadoview
The HW30 HeatWatch features a robust design with clearly labeled buttons for easy operation and a large LCD for clear readings.

Figura 4.1: Fronte view of the Extech HW30 HeatWatch, showing the display and control buttons.

Figura 4.2: detallada view of the HW30 display, indicating humidity (50%), temperature (86°F), and heat index (88°).
4.1. Controles e pantalla
- Botón START/STOP: Initiates and pauses timing functions.
- Botón MODE: Cycles through different operating modes (Time, Stopwatch, Humidity/Temperature/Heat Index, Alarm).
- LAP/SPLIT/RESET Button: Records lap/split times or resets the stopwatch.
- Botón RECALL: Accesses stored lap/split memory.
- Pantalla LCD: Shows time, measurements, and function indicators.
5. Configuración
5.1. Instalación da batería
The HW30 HeatWatch requires one Lithium Metal battery for operation. The battery is typically included with the device.
- Localice a tapa do compartimento da batería na parte traseira da unidade.
- Use a small screwdriver or coin to open the battery compartment.
- Insert the Lithium Metal battery, ensuring correct polarity (+/-) as indicated inside the compartment.
- Coloque a tapa do compartimento da batería e fíxaa.
Nota: Elimina as baterías usadas de forma responsable segundo a normativa local.
6. Instrucións de funcionamento
This section details the various functions and modes of the HW30 HeatWatch.

Figure 6.1: The HW30 HeatWatch being held, demonstrating its portable and ergonomic design for active use.
6.1. Funcionamento básico e selección de modo
Preme o MODO para percorrer os seguintes modos de visualización:
- Modo de tempo: Displays the current time (12 or 24-hour format).
- Modo cronómetro: For timing events, including lap/split functions.
- Humidity/Temperature/Heat Index Mode: Shows environmental readings.
- Modo de alarma: For setting and activating the programmable alarm.
6.2. Axuste da hora e da data
- No modo de tempo, manteña premido o botón MODO button until the time digits begin to flash.
- Usa o INICIAR/PARAR button to adjust the flashing digit (hours, minutes, seconds).
- Preme o LAP/SPLIT/RESET button to move to the next digit or setting (e.g., 12/24-hour format, date).
- Unha vez configurados todos os axustes, prema o botón MODO button to exit setup.
6.3. Using the Stopwatch Functions
- Cambia ao modo cronómetro usando o botón MODO botón.
- Preme INICIAR/PARAR para comezar a cronometrar.
- Preme LAP/SPLIT/RESET to record a lap or split time. The display will momentarily show the recorded time while the stopwatch continues to run in the background.
- Preme INICIAR/PARAR de novo para pausar o cronómetro.
- Para retomar, prema INICIAR/PARAR. Para restablecer, prema LAP/SPLIT/RESET while the stopwatch is paused.
- To recall stored lap/split times, press the LEMBRAR button in Stopwatch Mode. Use LAP/SPLIT/RESET to scroll through memory.
6.4. Humidity, Temperature, and Heat Index Measurement
The HW30 automatically measures and displays humidity, temperature, and calculates the heat index in the dedicated mode.
- Switch to Humidity/Temperature/Heat Index Mode using the MODO botón.
- The display will show the current humidity percentage, temperature (in °F or °C), and the calculated heat index.
- Allow a few minutes for the sensors to stabilize and provide accurate readings, especially when moving the device between environments with different conditions.
6.5. Configuración da alarma
- Switch to Alarm Mode using the MODO botón.
- Manteña premido o MODO button until the alarm time digits begin to flash.
- Usa o INICIAR/PARAR button to adjust the flashing digit (hours, minutes).
- Preme o LAP/SPLIT/RESET button to move between hours and minutes.
- Unha vez axustada a hora de alarma desexada, prema o botón MODO botón para confirmar.
- Para activar ou desactivar a alarma, prema o botón INICIAR/PARAR button in Alarm Mode. An alarm icon will appear on the display when activated.
7. Mantemento
7.1. Limpeza
- Limpe a unidade cun d, suaveamp pano. Non use produtos de limpeza ou disolventes abrasivos.
- Ensure the device is dry before storage or further use.
7.2. Almacenamento
- Store the HW30 in a cool, dry place away from direct sunlight and extreme temperatures.
- If storing for extended periods, it is recommended to remove the battery to prevent leakage.
7.3. Substitución da batería
Replace the battery when the display becomes dim or the unit ceases to function. Refer to Section 5.1 for battery installation instructions.
8 Solución de problemas
This section addresses common issues you might encounter with your HW30 HeatWatch.
| Problema | Causa posible | Solución |
|---|---|---|
| Sen pantalla ou pantalla escura | Batería baixa ou descargada; instalación incorrecta da batería. | Replace the battery; Ensure battery is installed with correct polarity. |
| Lecturas de temperatura/humidade inexactas | Sensors not stabilized; Extreme environmental conditions. | Allow several minutes for the unit to acclimate to the environment; Ensure sensors are not obstructed. |
| Stopwatch not responding | Unit in incorrect mode; Buttons stuck. | Cycle through modes to Stopwatch Mode; Check for any physical obstructions on buttons. |
| Heat Index reading seems off | Heat index calculation is based on specific algorithms and can vary slightly; Sensor acclimation. | Ensure temperature and humidity readings are stable; Understand that heat index is a calculated value. |
9. Especificacións
Technical specifications for the Extech HW30 HeatWatch Humidity and Temperature Stopwatch:
| Especificación | Valor |
|---|---|
| Número de modelo | HW30 |
| Dimensións do produto | 3.1 x 2.6 x 0.8 polgadas (7.9 x 6.6 x 2.0 cm) |
| Peso do elemento | 0.71 onzas (0.02 quilogramos) |
| Tipo de batería | 1 batería de metal de litio (incluída) |
| Material | Plástico |
| Cor | Verde |
| Fabricante | Extech |
| Primeira data dispoñible | 20 de abril de 2004 |
10. Garantía e soporte
Extech Instruments products are designed for reliability and performance. For specific warranty information, please refer to the warranty card included with your product or visit the official Extech Instruments website. For technical support, troubleshooting assistance beyond this manual, or to inquire about replacement parts, please contact Extech Instruments customer service through their official channels.
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