Radiacode 103
The Radiacode for people who mainly want isotope identification in a pocket size. If you just want dose readings, the 102 is enough.
Amazon $319$319
The Radiacode 103 rates 3.6 among scintillation and solid-state geiger counters; the GQ GMC-600 Pro rates 3.4 among alpha-beta-gamma counters ones. The GQ GMC-600 Pro costs $21 less ($298 vs $319).
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-600 Pro
The best value alpha-capable counter, with the same pancake tube as meters costing twice as much. A strong pick for checking surfaces, glass and minerals.
Amazon $298$298
Scores side by side
These two sit in different detector type classes (scintillation and solid-state and alpha-beta-gamma 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 | Radiacode 103 | GQ GMC-600 Pro |
|---|---|---|
| Overall rating | 3.6/5 | 3.4/5 |
| Sensitivity 25% | 78 1,800 CPM per µSv/h (Cs-137) | 42 348 CPM per µSv/h (Co-60) |
| Radiation types 20% | 40 gamma, X-ray, beta | 100 gamma, X-ray, beta, alpha |
| Dose-rate range 15% | 33 reads up to 1,000 µSv/h | 54 reads up to 4,250 µSv/h |
| Features 15% | 100 data logging, phone or cloud connection, gamma spectrum | 70 data logging, phone or cloud connection |
| Price 15% | 41 $319 | 43 $298 |
| Warranty 10% | 67 2-year warranty | 0 warranty not published, scored as none |
Specifications
| Radiacode 103 | GQ GMC-600 Pro | |
|---|---|---|
| Detection | ||
| Detector | Scintillator | Mica window GM tube |
| Tube or crystal | CsI(Tl) crystal | LND 7317 pancake |
| Radiation types | β γ X | α β γ X |
| Sensitivity | 1,800 CPM per µSv/h (Cs-137) | 348 CPM per µSv/h (Co-60) |
| Max dose rate | 1,000 µSv/h | 4,250 µSv/h |
| Energy range | - | from 10 keV |
| Gamma spectrum | Yes | No |
| Energy resolution (662 keV) | 8.4 % | - |
| Features | ||
| Data logging | Yes | Yes |
| Connection | Bluetooth | Wi-Fi |
| Battery | 1000 mAh rechargeable | 3.7 V rechargeable Li-ion |
| Battery life | 200 h | - |
| Build | ||
| Weight | 65 g | - |
| Warranty | 2 years | - |