- Switchable optics for far-field (75:1) and close-focus (1 mm, distance 70 mm) measurements
- Humidity module for determining surface moisture
- Instrument memory for 90 measurement protocols
- Visual and acoustic alarm if limit values exceeded
For measurements at a short distance to the measurement object, the close focus optics offer a measurement point diameter of only 1 mm at a distance of 70 mm. Two laser points mark the measurement area. Measurements can also be carried out by connecting additional probes. The limit values can be individually stored in the instrument; as soon as these upper and lower limit values are violated, an audible and an optical signal are given.
Specifications
testo 845 + testo 845 with integrated humidity module | testo 845 with integrated humidity module | ||
Sensor types | Infrared | Type K (NiCr-Ni) | Humidity module |
Meas. range | -35 to +950 °C | -35 to +950 °C | 0 to +100 %RH / 0 to +50 °C / -20 to +50 °C td |
Accuracy ±1 digit | ±2.5 °C (-35 to -20.1 °C) ±1.5 °C (-20 to +19.9 °C) ±0.75 °C (+20 to +99.9 °C) ±0.75% of mv (+100 to +950 °C) | ±0.75 °C (-35 to +75 °C) ±1% of mv (+75.1 to +950 °C) | ±2 %RH (2 to 98 %RH) ±0.5 °C (+10 to +40 °C) ±1 °C (remaining range) |
Resolution | 0.1 °C | 0.1 °C | 0.1 °C td / 0.1 %RH |
General technical data | |
Oper. temp. | -20 to +50 °C |
Storage temp. | -40 to +70 °C |
Battery type | 2 AA batteries |
Battery life | 25 h (without laser), 10 h (with laser without light), 5 h (with laser and 50% light) |
Measurement rate | t95: 150 ms; Scanning Max/Min/Alarm: 100 ms |
Emissivity | Adjustable 0.1 to 1.0 |
Material/Housing | black/gray, metal screen |
Optical resolution | Far field: 75:1 16 mm @ 1200 mm (90%) Close focus: 1 mm @ 70 mm (90%) |
Dimensions | 155 x 58 x 195 mm |
Weight | 465 g |
Warranty | 2 years |
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