UEI 550-B Digital Pocket Thermometer Review Posted: September 06, 2018 Under: Instant-Read Thermometers and Timers By Starfishht no Comments 1 Second Sampling Time Easy-To-Read LCD Data Hold On/Off Button Auto Power Off 5″ Stem NSF Approved -58° To 571°F Accuracy Plus Or Minus 1.8°F – Manufacturer: Universal Enterprises Inc.