The GLA Straight Probe is for GLA thermometers. They are compatible with all GLA Thermometers, including the new M900 series and the M700 and M750 series. GLA part# M207S-straight. 3" Straight probe only.
The 2" probe is usually used on smaller animals, such as pelicans.
The 3" probe is usually used on large animals such as cattle and swine.
The 4" probe is usually used on large animals such as cattle.