Hi Anne, yeah the H8 dataloggers are no longer available and were discontinued either earlier this year or last year. Anyways, they will not service them for calibration or RH sensor replacement.  You cannot service them yourselves and the only replacement parts you can do yourself is the rubber o-ring and battery.  I had bought the data shuttle, cable, software and 7 Hobo's.  I tried to work with Onset for a week to see if they would help me.  They said that they are warranted for two years and mine were just over two years old and out of warranty.  They tried to offer me other loggers with different software and such at a discount. I told them that if that is how they try and keep clients, thanks but no thanks.  What Onset loggers do you use? 

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