A great industrial solution to those small noisy signals.
DR 1200s are fixed frequency and gain.
DR 1600s have variable gain and frequency.
4-20mA versions.
Supplied tested and set up in a DIN Rail case. 

• Input - Single ended / differential
• Input Gain - 0, +20,+40,+60 dB. (X1,10,100)
• Frequency - 1200s 0.1 Hz to > 500 kHz fixed 
• Frequency - 1600s 1 Hz to 127 kHz
• Signal level - + / - 10 V 
• Input Coupling - AC (0.17Hz) / DC / IEPE (24V, 4 mA)
• Power - DC 9-30 Volts 3W  
• Connections - front screw terminals.