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REED Instruments
REED R4000SD Data Logging Vane Thermo-Anemometer
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Best Anemometers · head-to-head
REED R4000SD Data Logging Vane Thermo-Anemometer vs BTMETER BT-100APP Bluetooth Vane Anemometer
A sourced, side-by-side comparison. BTMETER BT-100APP Bluetooth Vane Anemometer is cheaper at $30.99. Every spec and price links to its source.
BTMETER
BTMETER BT-100APP Bluetooth Vane Anemometer
$30.99
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | REED R4000SD Data Logging Vane Thermo-Anemometer | BTMETER BT-100APP Bluetooth Vane Anemometer |
|---|---|---|
| US price | — | $30.99 |
| Brand | REED Instruments | BTMETER |
| Released | — | — |
| Wind speed range ms | 0.4 to 30 m/s (79-5906 ft/min) | 0.3 to 30 m/s (0.67-67.1 mph) |
| Airflow cfm cmm | — | CFM = velocity (ft/min) x duct cross-sectional area (ft²), user-entered area |
| Velocity accuracy | ±(2% of reading + 0.2 m/s / 40 ft/min) | ±5% of reading |
| Sensor type | Rotating vane, 72mm (2.8 in.) diameter, low-friction ball bearing | 8-vane wheel with dual temperature sensors |
| Temperature range | 0 to 50 °C (32 to 122 °F) ambient probe; optional Type K (-100 to 1300 °C) / Type J (-100 to 1200 °C) thermocouple input | -10 to 45 °C (14 to 113 °F), ±2 °C accuracy |
| Data hold logging | Onboard SD-card datalogging up to 16GB, adjustable 1-3600 sec sampling interval | Current/Max/Min/Average hold; Bluetooth live streaming to companion app (no onboard SD logging) |
| Backlit display | Yes | Yes |
Sources — REED R4000SD Data Logging Vane Thermo-Anemometer: reedinstruments.com (verified 2026-08-09). BTMETER BT-100APP Bluetooth Vane Anemometer: btmeter-store.com (verified 2026-08-09).
What's the difference between the REED R4000SD Data Logging Vane Thermo-Anemometer and BTMETER BT-100APP Bluetooth Vane Anemometer?
Where the two actually differ on the specs we track (5 of 7). Matching specs are omitted.
- Wind speed range ms: REED R4000SD Data Logging Vane Thermo-Anemometer 0.4 to 30 m/s (79-5906 ft/min) vs BTMETER BT-100APP Bluetooth Vane Anemometer 0.3 to 30 m/s (0.67-67.1 mph)
- Velocity accuracy: REED R4000SD Data Logging Vane Thermo-Anemometer ±(2% of reading + 0.2 m/s / 40 ft/min) vs BTMETER BT-100APP Bluetooth Vane Anemometer ±5% of reading
- Sensor type: REED R4000SD Data Logging Vane Thermo-Anemometer Rotating vane, 72mm (2.8 in.) diameter, low-friction ball bearing vs BTMETER BT-100APP Bluetooth Vane Anemometer 8-vane wheel with dual temperature sensors
- Temperature range: REED R4000SD Data Logging Vane Thermo-Anemometer 0 to 50 °C (32 to 122 °F) ambient probe; optional Type K (-100 to 1300 °C) / Type J (-100 to 1200 °C) thermocouple input vs BTMETER BT-100APP Bluetooth Vane Anemometer -10 to 45 °C (14 to 113 °F), ±2 °C accuracy
- Data hold logging: REED R4000SD Data Logging Vane Thermo-Anemometer Onboard SD-card datalogging up to 16GB, adjustable 1-3600 sec sampling interval vs BTMETER BT-100APP Bluetooth Vane Anemometer Current/Max/Min/Average hold; Bluetooth live streaming to companion app (no onboard SD logging)