HANNA INSTRUMENTS

Laboratory table, portable and pocket meters

Explanation:
table meters - stationary laboratory-mounted apparatus weighing> 1 kg, powered by an electric grid;
portable meters - portable apparatus with equivalent accuracy to desktops, weight 0.1 - 1 kg, feeding - from elements (AA or AAA type) or power supplies (optional);
pocket meters (testers) - low-format ("pen-size") meters with lower accuracy and reliability than previous ones, low price; very convenient for production process control or environmental studies outside the laboratory.

CONRAD ELECTRONICS

Portable pH meters, electronic thermometers, thermohygrometers, timers, material humidifiers, meteorological apparatus, gas burners, etc.

LUDWIG SCHNEIDER

Glass and digital thermometers, thermosensors, hydrometers