Check the listing for details. Vintage RARE T-25-BFL Geiger Muller Counter Tube Beta Detector USSR. Condition: Used. Listed at 43.00 USD. EXPERIMENTAL MECHANICAL WORKSHOP production of the 60s counter type T-25-BFL Mica window diameter ….. 25 mm Mica thickness……about 2mg/cm2 Counting start voltage (Vс) not higher than 1350 V The length of the plateau is not less than . . . . . . . 200 V The slope of the plateau by 1 volt is not more than . . . . 0.03% Background in lead protection 4 cm thick No more than ….. 27 pulses/min Recommended operating voltage Vc + 100 voltsweight 100g Note 1. To determine the optimal operating voltage it is necessary to remove the characteristics of the counter before starting work 2. To ensure continuous and stable operation of the meter, it is necessary: a) prevent the meter from getting any kind of pollution that could worsen the insulating properties; b) protect the meter from impacts and mechanical damage.Combined shipping is accepted Contact me via message for any question Shipping time - 10-30 days Item will be shipped immediately after payment Thing will be securely packed Delivery from Ukraine by postal service Thanks for looking!