SBM21 tubes

[Geiger]

Hello,
I offer miniature Geiger-Muller counter SBM-21 (russian name - СБМ-21).
New old stock. Factory packaging: sealed box. 200pcs in pack.
Negotiated price (request in pm or via e-mail).
Details of payment in the signature.

Specifications SBM-21:
Gamma sensitivity Cs137  at P=10 mkR:  6.5...9.5 pulses/sec
Working range:        350...475 V
Start of counting:     260 to 320 V
Slope of the current-voltage characteristic, % / V, not more than:  0,15
Plateau length:    at least 100 V
Amplitude of the voltage pulse:  at least 50V
Maximum counting:  no more than 650 pulses/sec
Background noise:  no more than 0.2 pulses/sec
Total length: 21 mm
Size: 6 x 16 mm
Weight: 0.8 grams

Since the packaging is sealed, the geiger counters have not been tested.
The appearance and standard factory packaging of the geiger counters will be attached a little later.

If anyone is interested, write to me: si8b@tutanota.com

[Geiger]

This is a real photo - standard factory packaging and tubes.