Digital Thermometers with premium specifications are usually expensive and hard to find. The new Comark KM-26 is accurate - 0.1% +/- 0.2C, waterproof and rugged, but has low price and ready availability. Measuring between -200 and 400C the unit is also rated for use in ambient temeperatures to -20C. As an added extra there is a built in 24hr count down timer.
Sensors are type T thermocouple - connected using standard miniature thermocouple plugs. ECEfast supplies a wide variety of probes, and can manufacture special designs.
The waterproof IP67 case is drop resistant and treated with BioCote anti microbial compounds to give permanent defence against cross contamination. Battery life is up to 5 years, and batteries are replaceable.