Radiation Alert Monitor 200
A compact professional survey meter that reads all four radiation types. Hobbyists get more sensitivity for less with a pancake-tube counter.
Amazon $799.95$799.95
The Radiation Alert Monitor 200 rates 3.0 among alpha-beta-gamma counters geiger counters; the GQ GMC-300S rates 2.8 among beta-gamma geiger counters ones. The GQ GMC-300S costs $743.97 less ($55.98 vs $799.95).
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.
GQ GMC-300S
A basic, cheap beta-gamma counter for checking background levels and hobby samples. Buy it to learn, not for emergencies.
Amazon $55.98$55.98
Scores side by side
These two sit in different detector type classes (alpha-beta-gamma counters and beta-gamma geiger counters), and each is scored against the reference points for its own class, so a rating says how well each does among its own detector type peers. How we rank explains each factor.
| Factor weight | Radiation Alert Monitor 200 | GQ GMC-300S |
|---|---|---|
| Overall rating | 3.0/5 | 2.8/5 |
| Sensitivity 25% | 17 107 CPM per µSv/h | 21 132 CPM per µSv/h (Co-60) |
| Radiation types 20% | 100 gamma, X-ray, beta, alpha | 40 gamma, X-ray, beta |
| Dose-rate range 15% | 43 reads up to 2,000 µSv/h | 17 reads up to 328 µSv/h |
| Features 15% | 52 data logging, phone or cloud connection (optional add-on) | 35 data logging |
| Price 15% | 8 $799.95 | 100 $55.98 |
| Warranty 10% | 33 1-year warranty | 0 warranty not published, scored as none |
Specifications
| Radiation Alert Monitor 200 | GQ GMC-300S | |
|---|---|---|
| Detection | ||
| Detector | Mica window GM tube | GM tube |
| Tube or crystal | mica end-window GM tube | - |
| Radiation types | α β γ X | β γ X |
| Sensitivity | 107 CPM per µSv/h | 132 CPM per µSv/h (Co-60) |
| Max dose rate | 2,000 µSv/h | 328 µSv/h |
| Energy range | from 10 keV | 100 to 3,000 keV |
| Gamma spectrum | No | No |
| Features | ||
| Data logging | Yes | Yes |
| Connection | Optional add-on | None |
| Battery | 2 x AA | 3.7 V rechargeable Li-ion |
| Battery life | 800 h | - |
| Build | ||
| Weight | 181 g | - |
| Warranty | 1 year | - |