Stores reference 27C/1926. Manufactured by Coxeter & Son Ltd. London. 1941 dated. Following servicing, repair and at other stipulated intervals all R.A.F. dinghies were subjected to a pressure test to ensure that they were capable of maintaining their specified pressure. The bouyancy tube was inflated with air and connected to a manometer by a length of rubber tubing for a given period (usually one hour), during which time the pressure must not drop beyond the limit allowed. The manometer is a mercury U-tube mounted in a wooden box. A side of the box is hinged and contains brief instructions for use together with a list of test pressures. A scale, calibrated in lb. per square inch is mounted vertically between the two glass tubes and is to be read against the left-hand or atmospheric tube. The scale can be adjusted vertically in order to set the zero mark to the level of the mercury. This example appears to be in good order (mercury removed). The case is in good solid condition with handle to the top, brass hinges and rubber feet. A paper label is attached having stores reference marks and 1943 test date. A but dusty and grubby, some paint loss (see photo) but appears to be in reasonable condition throughout. Stock code S20216.