# Extech 407730 Digital Sound Level Meter vs Tenma 72-947 Digital Sound Level Meter with USB Interface and Datalogging: specs and price compared

A sourced, side-by-side comparison of the Extech 407730 Digital Sound Level Meter (Extech) and Tenma 72-947 Digital Sound Level Meter with USB Interface and Datalogging (Tenma) among sound level meters. Extech 407730 Digital Sound Level Meter is the cheaper of the two at $114.

## Side by side

| Spec | Extech 407730 Digital Sound Level Meter | Tenma 72-947 Digital Sound Level Meter with USB Interface and Datalogging |
| --- | --- | --- |
| US price | $114 | $231.92 |
| Brand | Extech | Tenma |
| Measurement range (dB) | 40 to 130 dB | 30 to 130 dB |
| Accuracy (dB) | ±2 dB | ±1.4 dB |
| Frequency weighting | A, C | A, C |
| Time weighting | Fast/Slow | Fast (125ms) / Slow (1s) |
| Resolution (dB) | 0.1 | 0.1 |
| Data logging | No | Internal datalogging up to 20,000 records; USB interface with Windows datalogging software |
| Microphone type | 0.5 in. (12.7mm) electret condenser | 1/2 in. electret condenser |

## Key differences

- Measurement range (dB): Extech 407730 Digital Sound Level Meter 40 to 130 dB vs Tenma 72-947 Digital Sound Level Meter with USB Interface and Datalogging 30 to 130 dB
- Accuracy (dB): Extech 407730 Digital Sound Level Meter ±2 dB vs Tenma 72-947 Digital Sound Level Meter with USB Interface and Datalogging ±1.4 dB
- Time weighting: Extech 407730 Digital Sound Level Meter Fast/Slow vs Tenma 72-947 Digital Sound Level Meter with USB Interface and Datalogging Fast (125ms) / Slow (1s)
- Data logging: Extech 407730 Digital Sound Level Meter No vs Tenma 72-947 Digital Sound Level Meter with USB Interface and Datalogging Internal datalogging up to 20,000 records; USB interface with Windows datalogging software
- Microphone type: Extech 407730 Digital Sound Level Meter 0.5 in. (12.7mm) electret condenser vs Tenma 72-947 Digital Sound Level Meter with USB Interface and Datalogging 1/2 in. electret condenser

## Sources

- Extech 407730 Digital Sound Level Meter: https://www.extech.com/products/407730/ (extech.com, verified 2026-08-09)
- Tenma 72-947 Digital Sound Level Meter with USB Interface and Datalogging: https://www.farnell.com/datasheets/2616992.pdf (farnell.com, verified 2026-08-09)

Canonical: https://frontdeskreview.com/gear/sound-level-meters/extech-407730-vs-tenma-72-947/
Cite: Per The Front Desk Review, Extech 407730 Digital Sound Level Meter ($114) vs Tenma 72-947 Digital Sound Level Meter with USB Interface and Datalogging ($231.92) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/sound-level-meters/extech-407730-vs-tenma-72-947/
License: CC BY 4.0.