Field Instruments

The Handheld WBGT Checker 8778 is a professional heat stress monitoring instrument designed to measure environmental conditions and prevent heat-related illnesses in industrial, outdoor, and workplace environments.

This advanced meter evaluates Wet Bulb Globe Temperature (WBGT), providing a reliable index for assessing heat stress by combining temperature, humidity, and radiant heat effects.

Equipped with a globe thermometer sensor, real-time monitoring capability, and an audible alarm system, the 8778 ensures safe working conditions by alerting users when heat exposure reaches dangerous levels.

Its portable design, PC connectivity, and high-accuracy sensors make it ideal for safety officers, engineers, and field technicians.

Key Features

• Measures WBGT index for heat stress evaluation (Indoor & Outdoor)
• Simultaneous measurement of Air Temperature (TA), Globe Temperature (TG), and Humidity
• Audible alarm (buzzer) for heat danger zone warnings
• High-precision capacitance humidity sensor
• Built-in PC interface for real-time data logging
• Humidity self-calibration using salt bottle kits
• Protective sensor cover for durability during storage
• Suitable for both industrial and environmental monitoring
• Designed for heat stroke prevention applications

Technical Specifications

General Information

• Model: 8778
• Type: Handheld WBGT Heat Stress Meter

Temperature Measurement

• Range: 0°C to 50°C
• Resolution: 0.1°C / 0.1°F
• Accuracy: ±0.6°C

Humidity Measurement

• Range: 0.1% to 99.9% RH
• Resolution: 0.1% RH
• Accuracy:
  • ±3% RH (10–90% RH @ 25°C)
  • ±5% RH (others)

Globe Temperature (Black Ball Sensor)

• Range: 0°C to 80°C
• Accuracy:
  • Indoor: ±2°C (15–40°C)
  • Outdoor: ±3°C (15–40°C)

WBGT Measurement

• Range: 0°C to 50°C

📌 WBGT Formula:

• Indoor / no sun: WBGT = 0.7 × WB + 0.3 × TG
• Outdoor / full sun: WBGT = 0.7 × WB + 0.2 × TG + 0.1 × TA

General Specifications

• Display: LCD (28 × 33 mm)
• Stabilization Time: 15–25 minutes
• Battery: AAA × 2
• Battery Life: >250 hours
• Dimensions: 278.2 × 75 × 75 mm
• Weight: Approx. 140 g
• Operating Conditions:
  • Temp: 0°C to 50°C
  • Humidity: <80% RH

Included Accessories

• WBGT Meter (8778)
• Batteries (AAA ×2)
• User Manual
• Packaging box

Optional Accessories

• USB Cable & Software Kit
• RH Calibration Salt Bottles (33% / 75%)

Applications

• Workplace heat stress monitoring
• Industrial safety compliance
• Construction site safety
• Outdoor labor monitoring
• HVAC and environmental testing
• Sports and training safety management
• Foundries, factories, and high-temperature environments

How It Works

1. Power On – Turn on the device and allow stabilization
2. Measure – Sensor captures WBGT, temperature, and humidity
3. Analyze – Device calculates heat stress index
4. Alert – Buzzer warns when unsafe heat levels are reached
5. Record – Optional PC connection for data logging

Why Buy from FieldInstruments.lk?

• Genuine industrial-grade measurement instruments
• Competitive pricing in Sri Lanka
• Fast delivery island-wide
• Trusted supplier for safety and testing equipment
• Professional technical support and after-sales service

Fieldinstruments.lk
50/3, Angampitiya Rd, Ethul Kotte, Sri Lanka. 10100.
Phone: +94718555888 Email: info@fieldinstruments.lk