The Testo 835-H1 is a professional-grade non-contact measurement tool designed to simultaneously measure surface temperature (-50°C to +600°C) and relative humidity. Equipped with a humidity module, 4-point laser aiming, and a 50:1 optical resolution, it enables precise detection of thermal bridges, dew points, and surface moisture—ideal for building diagnostics, HVAC maintenance, and industrial quality control.

The device stores 200 measurement sets, features an adjustable emissivity function, and includes a backlit display for use in low-light environments.

• Temperature: -50°C to +600°C (non-contact via infrared)
• Humidity: Measures relative humidity, dew point, and surface moisture (aw value)

• 50:1 optical resolution (e.g., 5m distance = 10cm measurement spot)
• 4-point laser aiming for accurate target alignment

• Stores 200 measurement sets with customizable location tags
• Backlight display (30-second auto-off) for visibility in dim conditions

• Emissivity adjustment (0.10-1.00) for diverse surface types (metal, wood, plastic)
• Connectable external temperature probes for low-emissivity surfaces

• ABS + PC housing for durability in -20°C to +50°C environments
• Ergonomic buttons and joystick for intuitive operation