The Tinsley QJ23 is a stable and accurate Wheatstone bridge for resistance measurements. The 4 Rheostat decades may also be used as an adjustable 4-dial decade resistance box.
Wheatstone and Kelvin configurations are combined in the QJ31 portable bridge, achieving a wide overall measurement range from 0.0001Ohm to 1 Megohm.
The Tinsley QJ42 is a low cost portable dc double bridge for low resistance measurement below 11Ω
The Tinsley QJ57 is a self-contained portable DC Kelvin Bridge for high precision measurements of low resistance, conductivity and the calibration of other instruments.