The new Riken Keiki GX-3R is the smallest and lightest 4 Gas Confined Space monitor on the market . Measuring a tiny 58(w) x 65(H)x 26(D)mm and weighing only 100g it is a revolution in compact design. The GX-3R is ideal for confined space work as its size means it does not interfere with work even if it is attached in the breathing zone.