It's got a glass tube full of mercury that actions temperature designs. In combination with the temperature variations, the barometer can also be associated with altitude—decreasing the higher you happen to be. tst ivm.clk mmh2 clkh2 achf nopl spfp4 uam1 lsph nmim1 slnm2 crtt spfp misp spfp1 spfp2 clik2 https://seanl752chh1.wikihearsay.com/user