This glass thermometer is great quality and perfect for tracking fertility cycles using a glass basal thermometer. The reading are in celcius so all my friends in USA convert readings to Fahrenheit during the wk. (Celsius reading times 1.8. Take that answer and add 32! :)
I would recommend for those using natural fertility methods to track.
You will be able to see reading when you look at it from an angle. Before use shake down (i count to 25 in my head) to get to under 36C as recommneded in their (Geratherm) web site.
Tip: Before i used it i blessed it with 42 letter name of God to prevent breakage and long term use!