Dosimeter is a compact, portable surface contamination monitor designed to detect and quantify α, β, and γ radiation and is suitable for use in temperature ranges between 40°C to 50°C. Additionally, it can measure radiation dose rates within the range of 0.01 to 10,000 u Sv/h and features a programmable system with four alarm modes. It utilizes a pancake GM tube detector with detection capabilities for Sr-90 and Am-241 which offers precision and reliability, ensuring accurate radiation measurements in various settings.