DeltaTrak 12215 Certified Alarm Thermometer for lab remote use

I have several new and used DeltaTrak Thermometers. The new ones are in their original packaging with a warranty card and directions. At $10 the used units are undamaged and do not come with directions. All of these thermometers comes with undamaged probes and are warrantied to work accurately. The USD list price on these is $50. According to the manufacturerThe Certified Alarm Thermometer, model 12215, is a dual channel digital thermometer with an internal and an external sensor, minimum/maximum memory, a large, easy-to-read LCD, and high/low alarm settings. The internal sensor measure ambient air temperature and the external sensor monitors temperature inside freezers, refrigerators, or cold holding display cases. The external sensor has a 3 meter cable and a stainless steel, blunt probe enclosed in a sealed plastic bottle of propylene glycol, a solution that is classified as GRAS (generally recognized as safe). This enclosure prevents false alarms because the measurements of the probe are not impacted by rapid temperature fluctuations caused by frequent door openings that occur during normal use. This digital thermometer mimics temperature readings in a medium similar to the common fluids stored in refrigerators and freezers in pharmacies and labs. In addition to pharmaceutical applications, the thermometer may also be used in food applications such as cold-holding display cases, refrigerators, or freezers. This digital thermometer has a temperature-buffered sensor enclosed in a bottle of propylene glycol solution, which ensures accurate measurements that are not impacted by rapid temperature fluctuations caused by frequent refrigerator or freezer door openings. The propylene glycol solution is GRAS (generally recognized as safe) and mimics temperature readings in a medium similar to common fluids stored in food and laboratory refrigerators, freezers and cold display cases. Features: Includes Manufacturer’s Certificate of Compliance traceable to NIST Internal sensor for ambient air temperature External sensor with high/low alarm setting Switchable internal/external temperature display Minimum/Maximum memory for temperature readings Jumbo LCD display with back light Switchable °F/°C scale Magnetic attachment and fold away stand Specification Internal Sensor Range 14°F to 122°F (-10°C to 50°C) External Probe Range -58°F to 158°F (-50°C to 70°C) Accuracy ±1.0°F from 14°F to 77°F (±.5°C from -10°C to 25°C); ±2.0°F above 77°F (±1.0°C above 25°C) ±2.0°F below 14°F (±1.0°C below -10°C) Sampling Rate 10 seconds Display Resolution 0.1°F/°C Display Size 1.8in W x 0.87in H (46mm W x 22mm H) Instrument Size 3.15in W x 2.05in H x 0.67in D (80mm W x 52mm H x 17mm D) Case Material ABS polymer, resistant to chemicals and high impact External Probe Type/Size Stainless Steel, 0.7in L x 0.2in Dia (17.8mm L x 5mm Dia) External Sensor Bottle Polystyrene with PE cap, 1.6in L x 0.79in Dia (41mm L x 20mm Dia) External Sensor Buffer Propylene glycol (GRAS classified - Generally Recognized As Safe) External Sensor Cable 9.84ft x 0.08in Dia (3 meters x 2mm Dia) Battery Coin Cell Lithium Battery, user replaceable Certification CE mark, NIST traceable, WEEE DeltaTrak manufactures products under an ISO 9001:2008 registered quality management system. I am located on an acreage ten minutes south east of Edmonton.