Hygrometer/Psychrometer TFA Dostmann 30.5058.02 — Indoor Electronic Hygrometer, Digital, Battery-powered (AAA)

The TFA Dostmann 30.5058.02 is an indoor electronic hygrometer and psychrometer designed to monitor room temperature and relative humidity. The compact, battery-powered device features a rectangular digital display that shows current measurements, time, and date. It records maximum and minimum values over a selectable period and includes an alarm and an optional hourly chime for regular reminders. The hygrometer is suitable for placement on shelves, tables, or other flat surfaces in living rooms, bedrooms, offices and storage areas.

Advantages

This digital thermo-hygrometer provides straightforward monitoring of indoor climate with a clear digital readout for temperature and relative humidity. The max–min memory lets you review extremes over a chosen timeframe, while the time/date display and wake-up alarm add basic clock functions. Battery power (1.5 V AAA) and a compact form factor make the unit easy to position where you need it.

Suitable for

• Monitoring humidity and temperature in living rooms and bedrooms
• Use in home offices and workspaces
• Climate checks in storage areas, cabinets or wine racks
• General indoor air quality awareness and heating/ventilation adjustments

When it may not be suitable

The device is intended for indoor use only and is not suitable for outdoor exposure or harsh environments with direct water contact. It provides basic monitoring functions and may not meet requirements for laboratory-grade precision or specialised industrial monitoring.

Key specifications

• Measured values: air temperature and relative humidity
• Display: rectangular digital screen with time and date
• Memory: maximum and minimum value recall over selectable period
• Power supply: 1.5 V AAA battery
• Functions: alarm (wake-up) and switchable hourly chime
• Mounting: freestanding placement on shelves or tables

How to use

Insert a 1.5 V AAA battery, place the hygrometer on a stable surface away from direct heat sources or drafts, and let it stabilise for accurate readings. Use the controls to view current temperature and humidity, recall maximum and minimum values, set the time and date, and configure the alarm or hourly chime as needed. Regularly check and replace the battery to maintain continuous operation.

What to consider before purchase

• Intended use: indoor monitoring only, not waterproof or weatherproof
• Accuracy needs: suitable for home and office use but not for laboratory-level precision
• Power: requires a 1.5 V AAA battery (not included)
• Placement: perform best when placed away from direct sunlight, heaters, and drafts

Usage recommendations

Position the TFA Dostmann hygrometer at breathing height in the room and allow 30 minutes for readings to stabilise; use its max–min memory to track daily variations and adjust heating or ventilation accordingly.