Levell TM10 DC Null microvoltmeter is a good instrument for Wheatstone Bridge or applications needing a Null Meter or for sensitive DC voltage measurements.
Ranges 30uV to 300V. Minimum reading is 1uV on 30uV setting. Standard 9v battery operated. Asking $110AUD + postage. Located NSW, Australia. Send personal message to enut11 for more info.