A Solid State pH Control System for Algal Culturing and Uptake ...
Jan 17, 1974 ... Biology Department, Queens College (CUNY), Flushing, New York 11367.
RALPH GRUNEWALD .... was maintained at 45? + 1PC, and continuous illu- ...
Zero-Matic pH meter and an electric solenoid valve to regulate gas or ...
Commetns motor-best.ru :
Why not packed? Where is the soft protective layer? A lot comes bad with cracks. And it happens 220 v. Instead of 12 v.
Everything is fine, for two weeks the order was received in kiev.
Delivery 2 weeks, valves working!
Shipping month, not tracked. Packing is normal package.