The Isotech MEDUSA POTTS Temperature Calibrator is a 3-Zone Block Calibrator for automated fixed points with a temperature range of 86 to 1292°F (30 to 700°C). The Medusa 510 has a maximum operating temperature of 1022°F (550°C). The Medusa Model 511 can be used to 1292°F (700°C), and features three-zone control. In addition to the main heating zone, there are additional top and bottom heaters, which compensate for the end losses, creating a constant temperature zone across the well.

For Comparison Calibration, the Medusa should be used with an insert. The standard insert has six 8mm pockets, which are 250mm deep. Also available is an insert at 44mm diameter x 170mm deep, which is suspended from the top of the block so that the height is user-adjustable. For flexibility, the Medusa can also be used with accessories for infrared thermometers and surface sensors.

The Medusa is available in two models, the BASIC (B) and the SITE (S). The B model includes a sophisticated temperature controller with a dual display for Set Temperature and Dry Block Temperature. The calibration volume is 1.75 inches (44.5mm) by 11.25 inches (285mm) deep. Absolute stability is ±0.03°C.