QTY. 3. PHOTOVOLT AQUATEST IV. CAT. NO. 0212410

QTY. 3. PHOTOVOLT AQUATEST IV. CAT. NO. 0212410 ALL THREE OF THESE POWER UP AND STIRRER'S WORK ONE SAYS ERROR ELEC (ELECTRODE?) ONE SAYS ERROR SO IN ONE SAYS ERROR ELECT (ELECTRODE?). THESE ERROR MESSAGES MAYBE DUE TO THE FACT THAT THERE IS NO ELECTRODES OR PROBES HOOKED UP. (dfp032602d)