Six's thermometer - Wikipedia

Digi-Sense Liquid-In-Glass Maximum/Minimum Thermometer; -35 to 50C (-30 to 120F), Organic Liquid Fill from Cole-Parmer

Thermometer Press Button Max-Min

Traditional liquid-in-glass (mercury) min-max thermometer.

Brannan Digital Max Min Greenhouse Thermometer - Greenhouse Temperature Monitor to Measure Hi and Lo Temperatures in Greenhouse Garden or Home

ThermoWorks RT8100MAT MIN/MAX Recording Thermometer with Alarms

FlashCheck® Min-Max Alarm Digital Thermometer

FlashCheck® Lollipop Min/Max Thermometer, Model 11040 - DeltaTrak

Min/max thermometer, Temperature measuring equipment, Agricultural Measuring, Products