Testing

The only bird photos that I took today were poor, so here is a photo that I took at work. The thermometers need to be tested every year to check that they're still reading correctly.  They need to agree with a new one within +or- 1.0 deg C.  These do agree quite well, but it's clear that they're not accurate to 0.1 deg C, as you might think from the fact that they give readings to 0.1 deg C.