A self contained disposable test unit for testing body fluid comprises a body member and a support member. This new and distinct variety has shown to be uniform and stable in the resulting generations from asexual propagation. The arming comparator compares the integrated signal with a predetermined arming threshold and provides an armed signal indicative thereof. The video switching instruction module instructs to switch among the video signals from the input systems on the basis of the priorities determined in the priority determination table. Based on this positional recognition result, the chip and the placement head are positioned by controlling a placement head driving mechanism. The transducer includes an optical bridge, a variable capacitor, or a flexible variable resistor.