Best thermometer for BBT monitoring?

[xWaterfallx]

I've just bought a Tommee Tippee thermometer, temp can be taken under the armpit or tongue. I've used it today to check it works and it keeps changing temperature even when using it several times in a row. Is there a better, more accurate thermometer I could get?

Does it read to 2 decimal places? E.g 36.41 I just bought one from Amazon I've had a few. This one is good www.amazon.co.uk/dp/B0014II7G6?ref=ppx_pop_mob_ap_share&tag=mumsnetforu03-21

@Meme69 no it doesn't have 2 decimal places, so it probably isn't accurate enough. Thank you for the link, I bought this one earlier, finger crossed it will be reliable! amazon.co.uk/Femometer-Thermometer-Fertility-Ovulation-Automatically/dp/B07VF464QD/ref=mp_s_a_1_1_sspa?dchild=1&keywords=femometer+thermometer&qid=1602276247&sprefix=Femometer+&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExQVJRVEhaQ0pWWURMJmVuY3J5cHRlZElkPUEwNDg2NTczMTU3S01CSkU3MFZQRCZlbmNyeXB0ZWRBZElkPUEwMzYxMjQ3TlhMNURRTzlKNEM0JndpZGdldE5hbWU9c3BfcGhvbmVfc2VhcmNoX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=]]

Not sure why the link went horrible! It's the Femometer Digital Basal Body Thermometer

@xWaterfallx That's the one I have, works just fine! Only annoying thing is the screen doesn't light up, so I have to use my phone screen to read the numbers!