Choosing a flow meter for pressure flow process measurement usually starts with a fork in the road: do you need an instrument you can carry from line to line, or a fixed meter that can stay on one pipe? Here are two very different answers: the portable ultrasonic TDS-100H and the 1-inch digital turbine. They take different approaches, and the decision comes down to where and how often you measure.
Quick Verdict
If you need one meter for a permanent single-line install, the inline digital turbine is the practical pick. If you need to survey liquid flow at multiple points, the portable ultrasonic TDS-100H is the more capable tool. Both list ±1% accuracy, so accuracy alone won't decide this.
At a Glance
| TDS-100H Portable Ultrasonic | 1" Digital Turbine | |
|---|---|---|
| Price | USD 300.00 | USD 25.99 |
| Measurement method | Ultrasonic | Turbine |
| Display | 4x16 English character panel | High-definition display with instantaneous and cumulative flow |
| Data | Data logger plus RS-232C | Works with output modules, sensors, remote transmitters |
| Best for | Moving survey work | Fixed fuel, water, diesel, kerosene lines |
Where the TDS-100H Wins
The TDS-100H is built for jobs where you can't dedicate a meter to every line. It is a portable ultrasonic liquid flowmeter with non-contact measurement, which makes it independent of system stress and harsh environments. The large measuring range of ±32 m/s (±104 ft/s) means it can handle high liquid velocities, and the RS-232C interface plus data logger store up to 10,000 lines of data for later transfer. If you're doing periodic checks around a plant, this is the instrument to keep for those rounds.
Where the 1-Inch Turbine Wins
The 1-inch digital turbine is the meter for a fixed, single-line job. It is an inline unit with a 1-inch NPT thread, and its display shows both instantaneous and cumulative flow. The modular design makes the internal components easier to replace and maintain. For a workshop or transfer station where the pipe size doesn't change, this is a meter you can leave in place.
Product Notes
#### Portable Ultrasonic Liquid Flowmeter TDS-100H
Pick the Portable Ultrasonic Liquid Flowmeter TDS-100H when your job is to check liquid flow at different points rather than monitor one fixed line. The non-contact ultrasonic approach means you can measure without disturbing the pipe content. The 4x16 English character display keeps readings easy to read in the field, the unit is available in black or silver, and its DN50-700 pipeline range gives it a wider reach than a single 1-inch meter. Its limitation is role: this is a survey instrument, not an inline meter for a single permanent installation. For a one-pipe setup that never changes, the ultrasonic meter is more instrument than the job needs.
#### 1" Digital Turbine Flow Meter
The 1" Digital Turbine Flow Meter is the straightforward choice for an inline install on a 1-inch fuel or water line. It has a waterproof body, a 1-inch NPT thread, and a modular design that makes the internal parts easier to replace and maintain. The unit supports switching among gallons, quarts, pints, liters, and cubic meters for local readings. The limitation is that it is tied to one pipe size: the 1-inch inline format can't be moved across the larger pipeline range the way the portable ultrasonic can, so its usefulness depends on the line staying at 1 inch. For that narrow role, it covers the basics without extra complexity.
Final Choice by Use Case
- Permanent single-line installation: Choose the 1" Digital Turbine Flow Meter. Its lower listed price matches the fixed scope of the job.
- Frequent surveys across different pipe sizes: Choose the Portable Ultrasonic Liquid Flowmeter TDS-100H. It is the one to carry when the measurement point changes.
