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Hello, I've got a testo 327-1 that I purchased back in 2019 when I went self employed. The analyser hasn't been calibrated since purchase. After around 18 months my business swayed more towards bathroom installs and I got stuck doing them for years. Now I'm fed up of them I re sat my exams, re registered with gas safe but need to calibrate my analyser. I haven't had a quote yet but seems you get charged more for a calibration depending on how many it's missed. With mine looking like 4/5 missed will the cost be worth it or should I look at a replacement?