| Pressure |
| Differential Range |
0 to 300 psi (0 to 2,068 kPa) |
| Gauge Range |
0 to 300 psi (0 to 2,068 kPa) |
| Resolution (best) |
0.001 psi (0.01 kPa) |
| Accuracy |
±1% of reading or .072 psi (0.5 kPa), whichever is greater |
| Units |
psi, in. H2O, ft H2O, kPa, mm Hg, in. Hg, m H2O, bar |
| Pressure Connection |
¼” 37• flare fitting, Male |
| Temperature |
| Operating (electronics) |
40 to 113°F (5 to 45°C) |
| Storage |
-4 to 140°F (-20 to 60°C) |
| Liquid Media |
32 to 180°F (0 to 82°C) |
| Probe |
-40 to 250°F (-40 to 121 °C) |
| Resolution |
0.1°F (0.1°C) |
| Accuracy |
±0.5°F (0.3°C) from 32 to 160°F
(0 to 71°C); max ± 2.0°F (1.2°C) from
-40 to 32°F (-40 to 0°C) and from
160 to 250°F (71 to 121°C) |
| Units |
°F, °C |
| Flow (HM685) |
| Range |
0 to 2,271 m3 /h, 0 to 9,999 USGPM (0 to 6,31 l/s) |
| Resolution (best) |
0.0001 USGPM (0.00001 l/s) |
| Accuracy |
per pressure accuracy + valve deviation |
| Units |
USGPM, UKGPM, m3/h, l/s, l/m |
| Time |
Constant |
| Statistics |
| min, max, average, sum up to 4,000 readings (HM685 only) |
| Data Storage |
| 4,000 combined readings, 100 Test IDs (HM685 only) |
| Logging Interval (HM685 only) |
| User selectable (1, 5, 10, 20, and 30 seconds) |
| External Meter Dimensions |
| 11.1 in. × 4.7 in. × 3.5 in. (28.2 cm × 11.9 cm × 8.8 cm) |
| Meter Weight with Batteries |
| 2.65 lbs (1.20 kg) |
| Power Requirements |
| Four AA-size cells, or AC adapter |