










| Measuring range | −40 to +150 °C |
|---|---|
| Accuracy | ±0,2 °C ±1 Digit (−25 to +74,9 °C) ±0,5 % of mv ±1 Digit (Remaining Range) ±0,4 °C ±1 Digit (+75 to +99,9 °C) ±0,4 °C ±1 Digit (−40 to −25,1 °C) |
| Resolution | 0,1 °C |
| Measuring range | −200 to +1370 °C |
|---|---|
| Accuracy | ±(0,3 °C + 0,1 % of mv) ±1 Digit |
| Resolution | 0,1 °C |
| Measuring range | 0 to +200 hPa |
|---|---|
| Accuracy | ±(0,1 hPa + 1,5 % of mv) ±1 Digit (25,001 to 200 hPa) ±(0,3 Pa + 1 % of mv) ±1 Digit (0 to 25 hPa) |
| Resolution | 0,001 hPa |
| Measuring range | 700 to 1100 hPa |
|---|---|
| Accuracy | ±3 hPa |
| Resolution | 0,1 hPa |
| Weight | 510 g (instrument) |
|---|---|
| Dimensions | 210 x 95 x 39 mm ((LxWxH)) |
| Operating temperature | −5 to +45 °C |
| Product-/housing material | Plastic |
| Protection class | IP40 |
| Connectable probes | 4 x digital Bluetooth® probe or testo Smart Probe; 2 x digital probe with fixed cable or temperature probe NTC with fixed cable (via Testo Universal Connector - TUC); 2 x temperature probe TC type K with fixed cable |
| Product colour | black/orange |
| Camera image size | Main camera: 8.0 MP; Front camera: 5.0 MP |
| Battery life | approx. 10 hrs continuous operation |
| Display type | 5.0" touch display, HD 1280*720 pixels, IPS (160 k) |
| Power supply | Rechargeable li-ion battery (5550 mAh) |
| Interface | Bluetooth®; USB |
| Memory | 2 GB; 1.000.000 measuring values |
| Storage temperature | −20 to +60 °C |
| Measuring range | 0 to +50 °C |
|---|---|
| Accuracy | ±0,5 °C |
| Resolution | 0,1 °C |
| Measuring range | 5 to 95 %RH |
|---|---|
| Accuracy | ±0,06 %RH/K (0 to +50 °C) long-term stability: ±1 %RH / year ±3 %RH (10 to 35 %RH) Hysteresis: ±1,0 %RH ±3 %RH (65 to 90 %RH) ±5 %RH (Remaining Range) ±2 %RH (35 to 65 %RH) |
| Resolution | 0,1 %RH |
| Measuring range | +700 to +1100 hPa |
|---|---|
| Accuracy | ±3,0 hPa |
| Resolution | 0,1 hPa |
| Measuring range | 0 to 10000 ppm |
|---|---|
| Accuracy | ±(100 ppm + 5 % of mv) (5001 to 10000 ) ±(50 ppm + 3 % of mv) (0 to 5000 ) |
| Resolution | 1 ppm |
| Storage temperature | −20 to +60 °C |
|---|---|
| Weight | 195 g |
| Dimensions | 295 x 50 x 40 mm |
| Operating temperature | −5 to +50 °C |
| Length probe shaft | 130 mm |
| Probe head diameter | 30 mm |
| Product colour | black/orange |
| Battery life | 21,5 h |
| Battery type | 4 x type AA batteries |
| Data transfer | Bluetooth® |
| Radio range | 20 m |
| Storage temperature | -20 to +60 °C |
|---|---|
| Weight | 250 g |
| Dimensions | 400 x 90 x 90 mm |
| Operating temperature | 0 to +50 °C |
| Cable length | 1,4 m |
| Probe head diameter | 820 mm |
| Product colour | black/orange |
| Standards | EN ISO 7730 / ASHRAE 55 |
| Measuring range | 0 to +50 °C |
|---|---|
| Accuracy | ±0,5 °C |
| Resolution | 0,1 °C |
| Measuring range | +700 to +1100 hPa |
|---|---|
| Accuracy | ±3,0 hPa |
| Resolution | 0,1 hPa |
| Measuring range | 0 to 5 m/s |
|---|---|
| Accuracy | ±(0,03 m/s + 4 % of mv) |
| Resolution | 0,01 m/s |
| Measuring range | 0 to +120 °C |
|---|---|
| Accuracy | Class 1 ¹⁾ |
| 1) According to standard EN 60584-1, the accuracy of Class 1 refers to -40 to +1000 °C (Type K), Class 2 to -40 to +1200 °C (Type K), Class 3 to -200 to +40 °C (Type K). | |
| Weight | 385 g |
|---|---|
| Dimensions | 250 x 150 x 150 mm |
| Cable length | 1,4 m |
| Emissivity | 0,95 |
| Probe head diameter | 150 mm |
| Product colour | Black |
| Weight | 5100 g |
|---|---|
| Dimensions | 730 x 220 x 245 mm ((LxWxH)) |
| Product colour | Black |
| Weight | 3250 g |
|---|---|
| Dimensions | 520 x 410 x 210 mm LxWxH |
| Product-/housing material | Plastic |
| Product colour | Black |
















































































Make sure you get the testo 420 volume flow hood for larger ceiling outlets and at the same time enjoy multiple maintenance benefits on HVAC systems. Because the flow hood with the removable measuring instrument is not only exceptionally light, it also guarantees accurate volume flow calculations at swirl outlets






























