FNIRSI GC-03
A cheap combined radiation and EMF meter for casual checks around the house. It is not a precise radiation instrument.
Amazon $79.99$79.99
The FNIRSI GC-03 is the better geiger counter overall, rated 2.6 to 2.5. The FNIRSI GC-03 leads on price and sensitivity. The Mazur PRM-7000 wins on features. The FNIRSI GC-03 costs $369.01 less ($79.99 vs $449).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Mazur PRM-7000
A rugged, long-running beta-gamma survey meter for people who want an instrument-grade build. Most home users get more for the money elsewhere.
Amazon $449$449
Which should you buy?
- Choose the FNIRSI GC-03 for price ($79.99 vs $449) and sensitivity (80 CPM per µSv/h (Co-60) vs 45 CPM per µSv/h (Cs-137)).
- Choose the Mazur PRM-7000 for features (data logging vs none of the listed features).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every beta-gamma geiger counters geiger counter; a clear win is highlighted. How we rank explains each one.
| Factor weight | FNIRSI GC-03 | Mazur PRM-7000 |
|---|---|---|
| Overall rating | 2.6/5 | 2.5/5 |
| Sensitivity 25% | 10 80 CPM per µSv/h (Co-60) | 0 45 CPM per µSv/h (Cs-137) |
| Radiation types 20% | 40 gamma, X-ray, beta | 40 gamma, X-ray, beta |
| Dose-rate range 15% | 50 dose-rate range not published (neutral score used) | 57 reads up to 5,000 µSv/h |
| Features 15% | 0 none of the listed features | 35 data logging |
| Price 15% | 90 $79.99 | 28 $449 |
| Warranty 10% | 0 warranty not published, scored as none | 33 1-year warranty |
Specifications
| FNIRSI GC-03 | Mazur PRM-7000 | |
|---|---|---|
| Detection | ||
| Detector | GM tube | GM tube |
| Tube or crystal | J321 / M4011 GM tube | LND 713 |
| Radiation types | β γ X | β γ X |
| Sensitivity | 80 CPM per µSv/h (Co-60) | 45 CPM per µSv/h (Cs-137) |
| Max dose rate | - | 5,000 µSv/h |
| Energy range | 48 to 1,500 keV | from 35 keV |
| Gamma spectrum | No | No |
| Features | ||
| Data logging | No | Yes |
| Connection | None | None |
| Battery | 1500 mAh rechargeable lithium | 9 V |
| Battery life | - | 60,000 h |
| Build | ||
| Weight | 141 g | 261 g |
| Warranty | - | 1 year |