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Good to hear you have got this sorted out! They are cheap to buy and I have one that does temperature as well, like you. Usually 'I believe' if they are inaccurate it may be that one of the prongs may be bent and so you may be able to bend the one which isn't straight to be straight but as you have a few I would just discard the one that is wrong! Simon

sorry for the late reply.and the hijack apparently my zero water TDS meter is about 40-80 ppm out, my other two, gree and mi.com is only 0-6 ppm differences, I will have another gree TDS coming in, so I will check again. The reason I got so many TDS meter, as I was going through taobao, I seen all the TDS meter really cheap, about USD 3.50, so I got a few, now my friends also want one, and the gree TDS meter also has temperature.