Introduction This product is designed to measure differential pressure (the difference between two pressure measurements). It offers 11 units of measure(user selectable): inH2O, psi, bar, mbar, kPa, inHg, mmHg, ozin2, , ftH2O, cmH2O, kgcm2 and has a differential input that uses convenient quick-disconect fittings. it is perfect for HVAC technician, operation maintenance engineers and researchers. as well as those in the pneumatic and medical fields.
| unit | ET-920 | ET-921 | ET-922 | |||
| range | resolution | range | resolution | range | resolution | |
| inH2O | ±55.40 | 0.01 | ±138 | 0.1 | ±415.2 | 0.1 |
| Psi | ±2.000 | 0.001 | ±5.000 | 0.001 | ±15.00 | 0.01 |
| Mbar | ±137.8 | 0.1 | ±344.7 | 0.1 | ±1034 | 1 |
| KPa | ±13.79 | 0.01 | ±34.47 | 0.01 | ±103.4 | 0.1 |
| inHg | ±0.407 | 0.001 | ±1.018 | 0.001 | ±30.54 | 0.01 |
| mmHg | ±103.4 | 0.1 | ±258.5 | 0.1 | ±775.7 | 0.1 |
| ozin² | ±32.00 | 0..01 | ±80 | 1 | ±240.0 | 0.1 |
| ftH2O | ±4.612 | 0.001 | ±11.53 | 0.01 | ±34.60 | 0.01 |
| cmH2O | ±140.6 | 0.1 | ±351.5 | 0.1 | ±1055 | 1 |
| kgcm² | ±0.140 | 0.001 | ±0.351 | 0.001 | ±1.055 | 0.001 |
| bar | ±0.137 | 0.001 | ±0.344 | 0.001 | ±1.034 | 0.001 |
| Maximum Pressure | 10 psi | 20 psi | 100 psi | |||
| Accuracy | ±0.3%FS | |||||
| Linearity/Hysteresis | ±0.1%FS | |||||
| Repeatability | ±0.25%FS | |||||
| Input ports | Two metal 4.5mm barbed for 1/8〞（3.18mm）ID tubing | |||||
| Working temperature | 0～40℃/32～104℉ | |||||
| Storage temperature | -10～60℃/14～140℉ | |||||
| Overrange indication | ERR1 or ERR2 | |||||
| Power supply | 9V battery | |||||
