Testo 184 H1 Temperature and Humidity Data Logger

The Testo 184 H1 is a reusable temperature and humidity logger that records temperature and relative humidity from -20 to +70°C. Testo specifies the 184 H1 at ±0.5°C (0 to +70°C), ±0.8°C (-20 to 0°C) accuracy with 0.1°C resolution. On the 184 H1, humidity is measured from 0 to 100 %RH at ±2 %RH (35 to <65 %RH), ±3 %RH (15 to <35 and 65 to <80 %RH), ±5 %RH (0 to <15 and 80 to 100 %RH) at +25°C; ±0.03 %RH/K (0 to +60°C). Down to -20°C, the 184 H1 covers 2–8°C fridges as well as -20°C freezers.

Memory holds 60,000 readings with an interval settable from 1 min to 24 h, about 625 days of logging at 15-minute steps. Testo lists the maximum runtime of the 184 H1 as Unlimited. Recording on the 184 H1 starts by scheduled. Plugging the 184 H1 into a PC through its USB connector creates a PDF report automatically.

Physically, the 184 H1 has Segment LCD (one-line, no backlight) display, IP30 protection and a replaceable battery. Listed approvals for the 184 H1: CE and HACCP International. For calibration, the 184 H1 comes with: electronic calibration certificate stored on logger. In practice the Testo 184 H1 fits storage areas where humidity affects quality, 2–8°C or frozen.