The heart of the KOOLTRAK™ system is the KOOLTRAK™ temperature logger. In a waterproof stainless steel can hardly bigger than a dime, contains a complete recording system with microcomputer, memory, communications circuitry, temperature sensor, clock, and lithium battery power supply. The wide temperature range, long recording time and 10 year life make this amazing product the first choice for compact, low cost temperature recording. Price Discounts Range: 50 - 100 = $38.41 Range: 100+ = $33.61