Models 333 & 334 Digital Melting Point Meters feature an LCD display for faster and easier readability. The LCD readout also eliminates parallax. Instrument measures the melting point of various substances. Used for testing plastics, waxes, resins, inks, gums, fats, tars, low melting alloys, organic and inorganic compounds, etc. Models 333 & 334 operates over a range of 120°F to 500°F and 50°C to 260°C along the platen bar. The LCD can be set to display either Fahrenheit or Celsius by the user.

The instrument is portable and can be used on any workbench or desk. The model 333 operates on 110 volts AC, while the 334 runs on 220 volts AC. The LCD display is powered by a 9-volt battery. Pilot light located next to the on/off switch cautions the user that the heating element is on. Stainless steel platen (the long square bar in the foreground of the photo) heats up on a precisely designed temperature gradient. Platen takes approximately 20 to 30 minutes to fully come up to temperature. Any of the four sides of the platen can be used as the test side.

The test method is simple and fast to perform, and only a few milligrams of the sample material is required. A small amount of the substance is placed along on the upper surface of the platen. The demarcation line between the molten and solid particles of the sample will be quickly seen. The thermocouple junction is placed at this demarcation point on the platen and the temperature read. For the most accurate results, place a small amount of the sample directly on the thermocouple tip and move the thermocouple from right to left along the platen until the sample just melts. The temperature reading at this point is the most accurate.