A pressure gauge will only cost about £10 tops from a pneumatic/hydraulic supplies merchant. I can't think of any hire options for an analyser which is an easily destroyed item in inexperienced hands.
Looking at the T&Cs, it is not a contract I would like to enter into. Being responsible for damage can open a real can of worms, and an analyser used on oil boilers is subject to more contamination than on other fuels.
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