Are barteries are needed? Or are rechargeables ones provided.

The rechargeable battery is installed in the device. You do not need to buy other battery, you only need to connect it to USB port to charge it.

can the beeper be turned off?

Both the clicker for incoming detections and the beeper for threshold/safety exceeded can be turned off. If you do that though, best watch the display closely, as the 3.5 mm socket on the side of it is an analogue data port, not a headphone socket.

How is the time and date set? The 4 front buttons don't appear to access that function??

You can set the date and time from Main menu->Init setup->Date Time menu.

How often it has to be calibrated (by third party specialist) to maintain accuracy?

Digital meters usually do not require further calibration once they leave the factory. The accuracy remains the same unless you physically change something in the settings.

Manufacturer	GQ Electronics LLC
Part number	GMC300EPlus Fulfill
Item Weight	170 g
Product Dimensions	12.7 x 7.11 x 2.54 cm; 170.1 g
Batteries	1 Lithium Ion batteries required. (included)
Item model number	GMC300EPlus Fulfill
Size	5
Colour	White
Voltage	5 Volts
Item Package Quantity	1
Light source	led
Included components	Digital Nuclear Radiation Detector Monitor Meter
Batteries included?	Yes
Batteries Required?	Yes
Battery Cell Type	NiMH

GMC300Eplus Fulfill Digital Geiger Counter NULCEAR Radiation Detector Monitor Meter Dosimeter Beta Gamma X-ray Datalogger Recorder Real-time monitoring, private home use All purpose, wall charger

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