The Hull cell is a type of test cell used to qualitatively check the condition of an electroplating bath; It allows for optimization for current density range, optimization of additive concentration, recognition of impurity effects and indication of macro-throwing power capability. The Hull cell replicates the plating bath on a lab scale. It is filled with a sample of the plating solution, an appropriate anode which is connected to a rectifier the "work" is replaced with a hull cell test panel that will be plated to show the "health" of the bath.

The Hull cell is a trapezoidal container that holds 267 ml of solution. This shape allows one to place the test panel on an angle to the anode. As a result, the deposit is plated at different current densities which can be measured with a hull cell ruler. The solution volume allows for a quantitative optimization of additive concentration: 1 gram addition to 267 ml is equivalentto 0.50z/gal in the plating tank. 

Kiran Test & Measures Pvt. Ltd., designed SMPS Based CVCC Type Rectifiers for Hull Cell Testing are which utilize filtered circuits capable of continuously producing minimum AC ripple. This filtered current output is essential for testing many plating baths. Kiran Rectifiers are strongly recommended for Hull Cell test because results are misleading when single phase unfiltered current is used.