BEEP-R (version2) basic description

The Beep-R box is used for checking samples on typical resistance.
Normal multimeters use several volts and mA's to test.
This box uses only 10mV and current is limited to 100uA-max.
A switch to reverse connections helps to check for possible
thermocouples (reverse should give the same readout without 
thermocouples).
Range without switching is 10ohm to 10Gohm. 
Speakers produce a frequency which is proportional to conductance and
enable to hear fluctuations (e.g. bad contacts).

On the front:
Lemo pin4=10mV pin2=0mV (or reversed when using reverse switch)
thermo check reverse switch
volume knob
LED-scale for indication resistance (+/-1 LED)
 

On the back: 
voltage output can be used for logging 
ext speaker output for noisy environment
on/off batt.test switch (batt life >500hrs)
fast/slow switch for frequency output tracking speed