Checking pH electrode functionality , and maintenance

From sigma aldrich

From Apera:

From phionics :

Hach maintenance guide. Another one. Very illustrative

YSI: To extend life

Flairform

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劣質洗衣機入水喉

上面白色是最易找到,$2x. 但漏水. 灰色, $4x, 是假冒 "MADE IN ITALY" 假冒 "MADE IN ITALY" 的標緻左面是白色膠喉的喉頭, 右面是灰色膠喉的喉頭, 上圖左面是真正好貨 ( MADE IN ITALY )灰色膠蓋.右面是冒牌白色膠蓋. 膠蓋在安裝扭緊時爆開上圖左面是真正好貨 , 標了其他規格.右面是冒牌, 單單印了 MADE IN ITALY 好貨的膠蓋是可以下移, 露出喉頭及黑色軟膠墊黑色軟膠墊是有坑紋. 質感較柔軟. 緊後可以"迫實"水龍頭及喉蓋, 沒有滲漏正板 MADE IN ITALY 賣 $4x, 價錢絕對合理. 冒牌貨在旺角新填地街買的, 也是$4x. 真是要小心!!! NB: MADE IN ITALY 是否真正意大利制造實在無從考証

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ES8311 and ES8388 codec IC

ES8388 audio codec module is one of the audio codec modules available that is supported by ESP32 and official ESP-ADF releases. The ES8388 module lets you have: Stereo microphone and line input Stereo headphone and line out Up to 96 kHz 24 bpp high quality audio This module is compatible with all MCUs that have I2C and I2S ports (like ESP32, ESP8266, STM32, i.MX6, Raspberry Pi, etc) ES8311 Maxgerhardt github PCBartist twblogs ESP32-A1S (limited stock)Audio codec AC101 or ES8388 built-in. NB the pinouts and firmware are different! Arduino - ESP31-A1S instructable Phil Schatzmann and his github Simple A2DP thaaraak github on ESP32-A1S github of Yveaux and Marcel-licence ESP ADF example: Logitech PiCorePlayer squeeze lite squeezebox forum ESP32-Audio-kit (from AI thinker) based on ESP32-A1S, is simple and small. But upgrade-ability seems limited Alex John Talbert mixer equalizer: can this be used as simple equalizer? how about proces...

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sharpstar 150mm f/2.8 hyperbolic astrograph

to be launched in summer, 2019. spot diagram is now available, and connections diagram to camera is shown . list price RMB 13,000 ( USD 1900 approx) comparing this with Takahashi epsilon-180ED: spot diagram: connections: the focuser is 2.5 inch, and threads are M48 x 0.75mm cloudynights first impression threads some nice photo review from skypoint Astrofotoblog review c

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Hello!! It's Joseph

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