You can download the full or the Russian Original Manual (PDF) for more detailed schematics and measurement formulas.

: To measure surface contamination, remove the rear filter cover to expose the Geiger-Müller tubes directly to the surface.

: Over time, these displays can leak or turn black due to poor bonding. If yours is still clear, avoid storing it in extreme temperatures or direct sunlight.

: For low-level measurements, it is recommended to repeat and average results to account for stochastic variation in radiation counts.